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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/dev/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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class="MuiContainer-root MuiContainer-maxWidthXl doc-content css-1ekb41w"><div class="markdown-body MuiBox-root css-0"><h1 id="日期和时间函数" style="position:relative"><a href="#%E6%97%A5%E6%9C%9F%E5%92%8C%E6%97%B6%E9%97%B4%E5%87%BD%E6%95%B0" aria-label="日期和时间函数 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>日期和时间函数</h1><p>TiDB 支持使用 MySQL 5.7 中提供的所有<a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">日期和时间函数</a>。</p><style data-emotion="css 1weqspv">.css-1weqspv{padding-top:0.5rem;padding-bottom:0.5rem;}.css-1weqspv .MuiAlert-message p{margin-bottom:0px;margin-top:0px;}</style><div class="MuiBox-root css-1weqspv"><style data-emotion="css 17zlexa">.css-17zlexa{font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(1, 67, 97);background-color:rgb(229, 246, 253);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-17zlexa .MuiAlert-icon{color:#03a9f4;}</style><style data-emotion="css 152gid5">.css-152gid5{background-color:#fff;color:rgba(0, 0, 0, 0.87);-webkit-transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;border-radius:4px;box-shadow:none;font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(1, 67, 97);background-color:rgb(229, 246, 253);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-152gid5 .MuiAlert-icon{color:#03a9f4;}</style><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-152gid5" role="alert"><style data-emotion="css 1l54tgj">.css-1l54tgj{margin-right:12px;padding:7px 0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;font-size:22px;opacity:0.9;}</style><div class="MuiAlert-icon css-1l54tgj"><style data-emotion="css 1cw4hi4">.css-1cw4hi4{-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:inherit;}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 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">注意</div><ul><li>MySQL 常常会接受格式不正确的日期和时间值。例如，<code>'2020-01-01\n\t01:01:01'</code> 和 <code>'2020-01_01\n\t01:01'</code> 被视为有效的日期和时间值。</li><li>TiDB 会尽量与 MySQL 的行为保持一致，但可能无法在所有情况下完全匹配。建议使用正确的格式化日期，TiDB 文档中未记录将如何处理格式不正确的值。</li></ul></div></div></div><h2 id="日期时间函数表" style="position:relative"><a href="#%E6%97%A5%E6%9C%9F%E6%97%B6%E9%97%B4%E5%87%BD%E6%95%B0%E8%A1%A8" aria-label="日期时间函数表 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>日期时间函数表</h2><table><thead><tr><th>函数名</th><th>功能描述</th></tr></thead><tbody><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_adddate" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>ADDDATE()</code></a></td><td>将时间间隔添加到日期上</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_addtime" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>ADDTIME()</code></a></td><td>时间数值相加</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_convert-tz" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CONVERT_TZ()</code></a></td><td>转换时区</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_curdate" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CURDATE()</code></a></td><td>返回当前日期</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_current-date" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CURRENT_DATE()</code>, <code>CURRENT_DATE</code></a></td><td>与 CURDATE() 同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_current-time" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CURRENT_TIME()</code>, <code>CURRENT_TIME</code></a></td><td>与 CURTIME() 同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_current-timestamp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CURRENT_TIMESTAMP()</code>, <code>CURRENT_TIMESTAMP</code></a></td><td>与 NOW() 同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_curtime" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>CURTIME()</code></a></td><td>返回当前时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DATE()</code></a></td><td>从日期或日期/时间表达式中提取日期部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-add" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DATE_ADD()</code></a></td><td>将时间间隔添加到日期上</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-format" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DATE_FORMAT()</code></a></td><td>返回满足指定格式的日期/时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-sub" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DATE_SUB()</code></a></td><td>从日期减去指定的时间间隔</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_datediff" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DATEDIFF()</code></a></td><td>返回两个日期间隔的天数</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_day" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DAY()</code></a></td><td>与 DAYOFMONTH() 同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_dayname" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DAYNAME()</code></a></td><td>返回星期名称</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_dayofmonth" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DAYOFMONTH()</code></a></td><td>返回参数对应的天数部分(1-31)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_dayofweek" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DAYOFWEEK()</code></a></td><td>返回参数对应的星期下标</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_dayofyear" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>DAYOFYEAR()</code></a></td><td>返回参数代表一年的哪一天 (1-366)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_extract" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>EXTRACT()</code></a></td><td>提取日期/时间中的单独部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_from-days" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>FROM_DAYS()</code></a></td><td>将天数转化为日期</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_from-unixtime" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>FROM_UNIXTIME()</code></a></td><td>将 Unix 时间戳格式化为日期</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_get-format" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>GET_FORMAT()</code></a></td><td>返回满足日期格式的字符串</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_hour" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>HOUR()</code></a></td><td>提取日期/时间表达式中的小时部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_last-day" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LAST_DAY</code></a></td><td>返回参数中月份的最后一天</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_localtime" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LOCALTIME()</code>, <code>LOCALTIME</code></a></td><td>与 NOW() 同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_localtimestamp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>LOCALTIMESTAMP</code>, <code>LOCALTIMESTAMP()</code></a></td><td>与 NOW() 同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_makedate" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MAKEDATE()</code></a></td><td>根据给定的年份和一年中的天数生成一个日期</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_maketime" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MAKETIME()</code></a></td><td>根据给定的时、分、秒生成一个时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_microsecond" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MICROSECOND()</code></a></td><td>返回参数的微秒部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_minute" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MINUTE()</code></a></td><td>返回参数的分钟部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_month" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MONTH()</code></a></td><td>返回参数的月份部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_monthname" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>MONTHNAME()</code></a></td><td>返回参数的月份名称</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_now" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>NOW()</code></a></td><td>返回当前日期和时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_period-add" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>PERIOD_ADD()</code></a></td><td>在年-月表达式上添加一段时间(数个月)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_period-diff" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>PERIOD_DIFF()</code></a></td><td>返回间隔的月数</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_quarter" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>QUARTER()</code></a></td><td>返回参数对应的季度(1-4)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_sec-to-time" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SEC_TO_TIME()</code></a></td><td>将秒数转化为 'HH:MM:SS' 的格式</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_second" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SECOND()</code></a></td><td>返回秒数(0-59)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_str-to-date" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>STR_TO_DATE()</code></a></td><td>将字符串转化为日期</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_subdate" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SUBDATE()</code></a></td><td>当传入三个参数时作为 DATE_SUB() 的同义</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_subtime" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SUBTIME()</code></a></td><td>从一个时间中减去一段时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_sysdate" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>SYSDATE()</code></a></td><td>返回该方法执行时的时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_time" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIME()</code></a></td><td>返回参数的时间表达式部分</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_time-format" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIME_FORMAT()</code></a></td><td>格式化时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_time-to-sec" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIME_TO_SEC()</code></a></td><td>返回参数对应的秒数</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timediff" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIMEDIFF()</code></a></td><td>返回时间间隔</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timestamp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIMESTAMP()</code></a></td><td>传入一个参数时候,该方法返回日期或日期/时间表达式，传入两个参数时候，返回参数的和</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timestampadd" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIMESTAMPADD()</code></a></td><td>在日期/时间表达式上增加一段时间间隔</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timestampdiff" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TIMESTAMPDIFF()</code></a></td><td>从日期/时间表达式中减去一段时间间隔</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_to-days" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TO_DAYS()</code></a></td><td>将参数转化对应的天数(从第 0 年开始)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_to-seconds" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>TO_SECONDS()</code></a></td><td>将日期或日期/时间参数转化为秒数(从第 0 年开始)</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_unix-timestamp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UNIX_TIMESTAMP()</code></a></td><td>返回一个 Unix 时间戳</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_utc-date" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UTC_DATE()</code></a></td><td>返回当前的 UTC 日期</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_utc-time" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UTC_TIME()</code></a></td><td>返回当前的 UTC 时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_utc-timestamp" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>UTC_TIMESTAMP()</code></a></td><td>返回当前的 UTC 日期和时间</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_week" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>WEEK()</code></a></td><td>返回参数所在的一年中的星期数</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_weekday" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>WEEKDAY()</code></a></td><td>返回星期下标</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_weekofyear" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>WEEKOFYEAR()</code></a></td><td>返回参数在日历中对应的一年中的星期数</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_year" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>YEAR()</code></a></td><td>返回参数对应的年数</td></tr><tr><td><a href="https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_yearweek" target="_blank" referrerpolicy="no-referrer-when-downgrade"><code>YEARWEEK()</code></a></td><td>返回年数和星期数</td></tr></tbody></table><h2 id="mysql-兼容性" style="position:relative"><a href="#mysql-%E5%85%BC%E5%AE%B9%E6%80%A7" aria-label="mysql 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>MySQL 兼容性</h2><p>TiDB 支持 <code>str_to_date()</code> 函数，但是无法解析所有的日期和时间值。此外，TiDB 不支持以下日期和时间格式化选项：</p><table><thead><tr><th>格式</th><th>说明</th></tr></thead><tbody><tr><td>"%a"</td><td>星期名的缩写（例如 Sun..Sat）</td></tr><tr><td>"%D"</td><td>带英文后缀的月份日期（例如 0th，1st，2nd，3rd）</td></tr><tr><td>"%U"</td><td>星期 (00..53)，星期日是每周的第一天；WEEK() mode 0</td></tr><tr><td>"%u"</td><td>星期 (00..53)，星期一是每周的第一天；WEEK() mode 1</td></tr><tr><td>"%V"</td><td>星期 (01..53)，星期日是每周的第一天；WEEK() mode 2；和 "%X" 一起使用</td></tr><tr><td>"%v"</td><td>星期 (01..53)，星期一是每周的第一天；WEEK() mode 3；和 "%x" 一起使用</td></tr><tr><td>"%W"</td><td>星期名（例如 Sunday..Saturday）</td></tr><tr><td>"%w"</td><td>一周中的天名 (0=Sunday..6=Saturday)</td></tr><tr><td>"%X"</td><td>星期天是每周第一天的年份，数字类型，四位数字</td></tr><tr><td>"%x"</td><td>星期一是每周第一天的年份，数字类型，四位数字</td></tr></tbody></table><p>更多信息，参见 <a href="https://github.com/pingcap/tidb/issues/30082" target="_blank" referrerpolicy="no-referrer-when-downgrade">GitHub Issue #30082</a>。</p><h2 id="相关系统变量" style="position:relative"><a href="#%E7%9B%B8%E5%85%B3%E7%B3%BB%E7%BB%9F%E5%8F%98%E9%87%8F" aria-label="相关系统变量 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>相关系统变量</h2><p><code>default_week_format</code> 变量影响 <code>WEEK()</code> 函数。</p></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 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