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8px;width:100%;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;cursor:pointer;-webkit-tap-highlight-color:transparent;}.css-khel7y:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-khel7y:hover{background-color:transparent;}}.css-khel7y.Mui-disabled{opacity:0.38;background-color:transparent;}.css-khel7y.Mui-focused{background-color:rgba(0, 0, 0, 0.12);}.css-khel7y.Mui-selected{background-color:rgba(25, 118, 210, 0.08);}.css-khel7y.Mui-selected:hover{background-color:rgba(25, 118, 210, 0.12);}@media (hover: none){.css-khel7y.Mui-selected:hover{background-color:rgba(25, 118, 210, 0.08);}}.css-khel7y.Mui-selected.Mui-focused{background-color:rgba(25, 118, 210, 0.2);}.css-khel7y .MuiTreeItem-iconContainer{margin-right:4px;width:15px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;}.css-khel7y .MuiTreeItem-iconContainer svg{font-size:18px;}.css-khel7y .MuiTreeItem-label{width:100%;min-width:0;padding-left:4px;position:relative;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;}</style><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css znl8a3">.css-znl8a3{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:0rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-znl8a3"><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><a class="MuiTypography-root MuiTypography-body1 css-tx8jsd" target="_blank" href="https://docs.pingcap.com/zh" style="text-decoration:none;width:100%;color:inherit"><style data-emotion="css 8atqhb">.css-8atqhb{width:100%;}</style><div class="MuiBox-root css-8atqhb"><style data-emotion="css 1hwyipb">.css-1hwyipb{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;color:inherit;font-size:0.875rem;line-height:1.25rem;}</style><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">文档中心</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-1" 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-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">关于 TiDB</div></div><style data-emotion="css xjq79n">.css-xjq79n{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:none;-moz-transform:none;-ms-transform:none;transform:none;}</style><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><style data-emotion="css 1jozaee">.css-1jozaee{margin:0;padding:0;margin-left:17px;}</style></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-2" 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-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">快速上手</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" 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">应用开发</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-0-4" 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"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">部署标准集群</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-0-5" 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">数据迁移</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">数据集成</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">运维操作</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">监控与告警</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-0-9" 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"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">故障诊断</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-0-10" 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-znl8a3"><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-0-11" 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-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">教程</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-0-12" 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-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB 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><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-13" 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-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">参考指南</div></div><style data-emotion="css 171pefp">.css-171pefp{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:rotate(90deg);-moz-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg);}</style><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><style data-emotion="css 1xxsnna">.css-1xxsnna{height:auto;overflow:visible;-webkit-transition:height 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:height 300ms cubic-bezier(0.4, 0, 0.2, 1) 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="false" id="left-nav-treeview-0-13-0" 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 kb2j4b">.css-kb2j4b{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:0.5rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">架构</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-0-13-1" 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">存储引擎 TiKV</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-0-13-2" 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">存储引擎 TiFlash</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-0-13-3" 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"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/system-variables"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">系统变量</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-4" 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">配置文件参数</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-0-13-5" 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"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">CLI</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-0-13-6" 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"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">命令行参数</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-0-13-7" 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">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" aria-expanded="false" id="left-nav-treeview-0-13-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div 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1ekb41w">.css-1ekb41w{width:100%;margin-left:auto;box-sizing:border-box;margin-right:auto;display:block;padding-left:16px;padding-right:16px;}@media (min-width:600px){.css-1ekb41w{padding-left:24px;padding-right:24px;}}@media (min-width:1536px){.css-1ekb41w{max-width:1536px;}}</style><div class="MuiContainer-root MuiContainer-maxWidthXl doc-content css-1ekb41w"><div class="markdown-body MuiBox-root css-0"><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 支持使用大部分 MySQL 5.7 中提供的<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>、一部分 MySQL 8.0 中提供的<a href="https://dev.mysql.com/doc/refman/8.0/en/string-functions.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">字符串函数</a>和一部分 Oracle 21 所提供的<a href="https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlqr/SQL-Functions.html#GUID-93EC62F8-415D-4A7E-B050-5D5B2C127009" target="_blank" referrerpolicy="no-referrer-when-downgrade">函数</a>。</p><p>关于 Oracle 函数和 TiDB 函数的对照关系，请参考 <a href="/zh/tidb/stable/oracle-functions-to-tidb">Oracle 与 TiDB 函数和语法差异对照</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/8.0/en/regexp.html#function_regexp-instr" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REGEXP_INSTR()</code></a></td><td align="left">返回满足正则的子字符串的第一个索引位置（与 MySQL 不完全兼容，具体请参考<a href="#%E6%AD%A3%E5%88%99%E5%87%BD%E6%95%B0%E4%B8%8E-mysql-%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7">正则函数与 MySQL 的兼容性</a>）</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-like" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REGEXP_LIKE()</code></a></td><td align="left">判断字符串是否满足正则表达式（与 MySQL 不完全兼容，具体请参考<a href="#%E6%AD%A3%E5%88%99%E5%87%BD%E6%95%B0%E4%B8%8E-mysql-%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7">正则函数与 MySQL 的兼容性</a>）</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-replace" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REGEXP_REPLACE()</code></a></td><td align="left">替换满足正则表达式的子字符串（与 MySQL 不完全兼容，具体请参考<a href="#%E6%AD%A3%E5%88%99%E5%87%BD%E6%95%B0%E4%B8%8E-mysql-%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7">正则函数与 MySQL 的兼容性</a>）</td></tr><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/8.0/en/regexp.html#function_regexp-substr" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>REGEXP_SUBSTR()</code></a></td><td align="left">返回满足正则表达式的子字符串（与 MySQL 不完全兼容，具体请参考<a href="#%E6%AD%A3%E5%88%99%E5%87%BD%E6%95%B0%E4%B8%8E-mysql-%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7">正则函数与 MySQL 的兼容性</a>）</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://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/TRANSLATE.html#GUID-80F85ACB-092C-4CC7-91F6-B3A585E3A690" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TRANSLATE()</code></a></td><td align="left">将字符串中出现的所有指定字符替换为其它字符。这个函数不会像 Oracle 一样将空字符串视为<code>NULL</code></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><tr><td align="left"><a href="https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_weight-string" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>WEIGHT_STRING()</code></a></td><td align="left">返回字符串的权重</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 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>不支持的函数</h2><ul><li><code>LOAD_FILE()</code></li><li><code>MATCH()</code></li><li><code>SOUNDEX()</code></li></ul><h2 id="正则函数与-mysql-的兼容性" style="position:relative"><a href="#%E6%AD%A3%E5%88%99%E5%87%BD%E6%95%B0%E4%B8%8E-mysql-%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="正则函数与 mysql 的兼容性 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>正则函数与 MySQL 的兼容性</h2><p>本节介绍 TiDB 中正则函数 <code>REGEXP_INSTR()</code>、<code>REGEXP_LIKE()</code>、<code>REGEXP_REPLACE()</code>、<code>REGEXP_SUBSTR()</code> 与 MySQL 的兼容情况。</p><h3 id="语法兼容性" style="position:relative"><a href="#%E8%AF%AD%E6%B3%95%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="语法兼容性 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>语法兼容性</h3><p>MySQL 的实现使用的是 <a href="https://github.com/unicode-org/icu" target="_blank" referrerpolicy="no-referrer-when-downgrade">ICU</a> (International Components for Unicode) 库，TiDB 的实现使用的是 <a href="https://github.com/google/re2" target="_blank" referrerpolicy="no-referrer-when-downgrade">RE2</a> 库，两个库之间的语法差异可以查阅 <a href="https://unicode-org.github.io/icu/userguide/" target="_blank" referrerpolicy="no-referrer-when-downgrade">ICU 文档</a>和 <a href="https://github.com/google/re2/wiki/Syntax" target="_blank" referrerpolicy="no-referrer-when-downgrade">RE2 文档</a>。</p><h3 id="匹配模式-match_type-兼容性" style="position:relative"><a href="#%E5%8C%B9%E9%85%8D%E6%A8%A1%E5%BC%8F-match_type-%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="匹配模式 match_type 兼容性 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>匹配模式 <code>match_type</code> 兼容性</h3><p>TiDB 与 MySQL 在 <code>match_type</code> 上的差异：</p><ul><li><p>TiDB 中 <code>match_type</code> 可选值为：<code>"c"</code>、<code>"i"</code>、<code>"m"</code>、<code>"s"</code>。MySQL 中 <code>match_type</code> 可选值为：<code>"c"</code>、<code>"i"</code>、<code>"m"</code>、<code>"n"</code>、<code>"u"</code>。</p></li><li><p>TiDB 中 <code>"s"</code> 对应 MySQL 中的 <code>"n"</code>，即 <code>.</code> 字符匹配行结束符。</p><p> 例如：MySQL 中 <code>SELECT REGEXP_LIKE(a, b, "n") FROM t1;</code> 在 TiDB 中需要修改为 <code>SELECT REGEXP_LIKE(a, b, "s") FROM t1;</code>。</p></li><li><p>TiDB 不支持 <code>match_type</code> 为 <code>"u"</code>。</p></li></ul><h3 id="数据类型兼容性" style="position:relative"><a href="#%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="数据类型兼容性 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>数据类型兼容性</h3><p>TiDB 与 MySQL 在二进制字符串 (binary string) 数据类型上的差异：</p><ul><li>MySQL 8.0.22 及以上版本中正则函数不支持二进制字符串，具体信息可查看 <a href="https://dev.mysql.com/doc/refman/8.0/en/regexp.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">MySQL 文档</a>。但在实际使用过程中，如果所有参数或者返回值的数据类型都是二进制字符串，则正则函数可以正常使用，否则报错。</li><li>TiDB 目前完全禁止使用二进制字符串，无论什么情况都会报错。</li></ul><h3 id="其它兼容性" style="position:relative"><a href="#%E5%85%B6%E5%AE%83%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="其它兼容性 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>其它兼容性</h3><p>TiDB 与 MySQL 在替换空字符串上的差异：</p><p>下面以 <code>REGEXP_REPLACE("", "^$", "123")</code> 为例：</p><ul><li>MySQL 不会对空串进行替换，其结果为 <code>""</code>。</li><li>TiDB 会对空串进行替换，其结果为 <code>"123"</code>。</li></ul></div></div></div><style data-emotion="css 11q09s7">.css-11q09s7{width:17.5rem;}@media (min-width:0px){.css-11q09s7{;}}@media (min-width:600px){.css-11q09s7{display:block;}}</style><div class="MuiBox-root css-11q09s7"><style data-emotion="css nljo0q">.css-nljo0q{position:-webkit-sticky;position:sticky;top:5rem;height:100%;max-height:calc(100vh - 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