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0ms;margin:0;padding:0;margin-left:17px;}</style><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-3-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css 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class="MuiTreeItem-label"><div class="css-snygwd"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据类型</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-3-0-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">函数与操作符</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css 5fc025">.css-5fc025{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:1.5rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/functions-and-operators-overview"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">函数与操作符概述</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/type-conversion-in-expression-evaluation"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">表达式求值的类型转换</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/operators"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">操作符</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/control-flow-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">控制流程函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a aria-current="page" style="text-decoration:none;width:100%;color:inherit" class="" href="/zh/tidb/v3.0/string-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">字符串函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/numeric-functions-and-operators"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数值函数与操作符</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/date-and-time-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">日期和时间函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/bit-functions-and-operators"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">位函数和操作符</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/cast-functions-and-operators"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">Cast 函数和操作符</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/encryption-and-compression-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">加密和压缩函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/information-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">信息函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/json-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">JSON 函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/aggregate-group-by-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">GROUP BY 聚合函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/window-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">窗口函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/miscellaneous-functions"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">其它函数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/precision-math"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">精度数学</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-3-16" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/expressions-pushed-down"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">下推到 TiKV 的表达式列表</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-0-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">SQL 语句</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/constraints"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">约束</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/generated-columns"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">生成列</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/partitioned-table"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">分区表</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/character-set-and-collation"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">字符集</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/sql-mode"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">SQL 模式</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-0-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/views"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">视图</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">配置</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">安全</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">事务</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">系统数据库</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/error-codes"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">错误码</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/connectors-and-apis"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">支持的连接器和 API</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">垃圾回收 (GC)</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">性能调优</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">监控指标</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/alert-rules"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">报警规则</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">最佳实践</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/tispark-overview"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiSpark 使用指南</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-3-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/tikv-overview"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiKV</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB Binlog</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">工具</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/v3.0/tidb-in-kubernetes"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB in Kubernetes</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">常见问题 (FAQ)</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">技术支持</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">贡献</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">版本发布历史</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><a 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12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><style data-emotion="css 1xsto0d">.css-1xsto0d{padding:8px 0;min-width:0;overflow:auto;}</style><div class="MuiAlert-message css-1xsto0d"><style data-emotion="css 1h2y6o4">.css-1h2y6o4{font-weight:500;margin-top:-2px;}</style><style data-emotion="css 17ioyuk">.css-17ioyuk{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;margin-bottom:0.35em;font-weight:500;margin-top:-2px;}</style><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-17ioyuk">重要</div><style data-emotion="css tx8jsd">.css-tx8jsd{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;}</style><p class="MuiTypography-root MuiTypography-body1 css-tx8jsd">你正在查看 TiDB 数据库的较旧版本 (TiDB v3.0) 的文档。如无特殊需求，建议使用 TiDB 数据库的<a hreflang="zh" href="/zh/tidb/stable/string-functions">最新 LTS 版本</a>。</p></div></div></div><h1 id="字符串函数" style="position:relative"><a href="#%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%87%BD%E6%95%B0" aria-label="字符串函数 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>字符串函数</h1><p>TiDB 支持使用 MySQL 5.7 中提供的大部分<a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">字符串函数</a>。</p><h2 id="支持的函数" style="position:relative"><a href="#%E6%94%AF%E6%8C%81%E7%9A%84%E5%87%BD%E6%95%B0" aria-label="支持的函数 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>支持的函数</h2><table><thead><tr><th align="left">函数名</th><th align="left">功能描述</th></tr></thead><tbody><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_ascii" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>ASCII()</code></a></td><td align="left">返回最左字符的数值</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_bin" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>BIN()</code></a></td><td align="left">返回一个数的二进制值的字符串表示</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_bit-length" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>BIT_LENGTH()</code></a></td><td align="left">返回字符串的位长度</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_char" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CHAR()</code></a> </td><td align="left">返回由整数的代码值所给出的字符组成的字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_char-length" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CHAR_LENGTH()</code></a></td><td align="left">返回字符串的字符长度</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_character-length" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CHARACTER_LENGTH()</code></a></td><td align="left">与 <code>CHAR_LENGTH()</code> 功能相同</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_concat" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CONCAT()</code></a></td><td align="left">返回连接的字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_concat-ws" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CONCAT_WS()</code></a></td><td align="left">返回由分隔符连接的字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_elt" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>ELT()</code></a></td><td align="left">返回指定位置的字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_export-set" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>EXPORT_SET()</code></a></td><td align="left">返回一个字符串，其中值位中设置的每个位，可以得到一个 on 字符串，而每个未设置的位，可以得到一个 off 字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_field" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>FIELD()</code></a></td><td align="left">返回参数在后续参数中出现的第一个位置</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_find-in-set" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>FIND_IN_SET()</code></a></td><td align="left">返回第一个参数在第二个参数中出现的位置</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_format" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>FORMAT()</code></a></td><td align="left">返回指定小数位数格式的数字</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_from-base64" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>FROM_BASE64()</code></a></td><td align="left">解码 base-64 表示的字符串，并返回结果</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_hex" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>HEX()</code></a></td><td align="left">返回一个十进制数或字符串值的 16 进制表示</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_insert" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>INSERT()</code></a></td><td align="left">在指定位置插入一个子字符串，最多不超过指定字符数</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_instr" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>INSTR()</code></a></td><td align="left">返回第一次出现的子字符串的索引</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_lcase" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LCASE()</code></a></td><td align="left">与 <code>LOWER()</code> 功能相同</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_left" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LEFT()</code></a></td><td align="left">返回最左侧指定长度的字符</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_length" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LENGTH()</code></a></td><td align="left">返回字符串长度，单位为字节</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html#operator_like" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LIKE</code></a></td><td align="left">进行简单模式匹配</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_locate" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LOCATE()</code></a></td><td align="left">返回第一次出现的子字符串的位置</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_lower" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LOWER()</code></a></td><td align="left">返回全小写的参数</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_lpad" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LPAD()</code></a></td><td align="left">返回字符串参数，左侧添加指定字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_ltrim" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LTRIM()</code></a></td><td align="left">去掉前缀空格</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_make-set" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MAKE_SET()</code></a></td><td align="left">返回一组用逗号分隔的字符串，这些字符串的位数与给定的 bits 参数对应</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_mid" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MID()</code></a></td><td align="left">返回一个以指定位置开始的子字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html#operator_not-like" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>NOT LIKE</code></a></td><td align="left">否定简单模式匹配</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/regexp.html#operator_not-regexp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>NOT REGEXP</code></a></td><td align="left"><code>REGEXP</code> 的否定形式</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_oct" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>OCT()</code></a></td><td align="left">返回一个数值的八进制表示，形式为字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_octet-length" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>OCTET_LENGTH()</code></a></td><td align="left">与 <code>LENGTH()</code> 功能相同</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_ord" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>ORD()</code></a></td><td align="left">返回该参数最左侧字符的字符编码</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_position" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>POSITION()</code></a></td><td align="left">与 <code>LOCATE()</code> 功能相同</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_quote" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>QUOTE()</code></a></td><td align="left">使参数逃逸，为了在 SQL 语句中使用</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/regexp.html#operator_regexp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REGEXP</code></a></td><td align="left">使用正则表达式匹配模式</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_repeat" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REPEAT()</code></a></td><td align="left">以指定次数重复一个字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_replace" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REPLACE()</code></a></td><td align="left">替换所有出现的指定字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_reverse" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REVERSE()</code></a></td><td align="left">反转字符串里的所有字符</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_right" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>RIGHT()</code></a></td><td align="left">返回指定数量的最右侧的字符</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/regexp.html#operator_regexp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>RLIKE</code></a></td><td align="left">与 <code>REGEXP</code> 功能相同</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_rpad" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>RPAD()</code></a></td><td align="left">以指定次数添加字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_rtrim" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>RTRIM()</code></a></td><td align="left">去掉后缀空格</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_space" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SPACE()</code></a></td><td align="left">返回指定数量的空格，形式为字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html#function_strcmp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>STRCMP()</code></a></td><td align="left">比较两个字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_substr" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SUBSTR()</code></a></td><td align="left">返回指定的子字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_substring" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SUBSTRING()</code></a></td><td align="left">返回指定的子字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_substring-index" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SUBSTRING_INDEX()</code></a></td><td align="left">从一个字符串中返回指定出现次数的定界符之前的子字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_to-base64" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TO_BASE64()</code></a></td><td align="left">返回转化为 base-64 表示的字符串参数</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_trim" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TRIM()</code></a></td><td align="left">去掉前缀和后缀空格</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_ucase" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UCASE()</code></a></td><td align="left">与 <code>UPPER()</code> 功能相同</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_unhex" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UNHEX()</code></a></td><td align="left">返回一个数的十六进制表示，形式为字符串</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_upper" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UPPER()</code></a></td><td align="left">参数转换为大写形式</td></tr></tbody></table><h2 id="不支持的函数" style="position:relative"><a href="#%E4%B8%8D%E6%94%AF%E6%8C%81%E7%9A%84%E5%87%BD%E6%95%B0" aria-label="不支持的函数 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path 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