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refine window functions and aggregate functions description #9657

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Jun 9, 2022
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refine window functions and aggregate functions description #9657

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refine window functions and agg functions description
tangenta Jun 2, 2022
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Update functions-and-operators/window-functions.md
TomShawn Jun 9, 2022
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Update functions-and-operators/window-functions.md
TomShawn Jun 9, 2022
f13f676
Update functions-and-operators/aggregate-group-by-functions.md
TomShawn Jun 9, 2022
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Update functions-and-operators/window-functions.md
TomShawn Jun 9, 2022
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2 changes: 2 additions & 0 deletions functions-and-operators/aggregate-group-by-functions.md
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Expand Up @@ -64,6 +64,8 @@ TiDB 支持的 MySQL `GROUP BY` 聚合函数如下所示：
1 row in set (0.00 sec)
```

上述聚合函数除 `GROUP_CONCAT()` 和 `APPROX_PERCENTILE()` 以外，均可作为[窗口函数](window-functions.md)使用。
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## GROUP BY 修饰符

TiDB 目前不支持 `GROUP BY` 修饰符，例如 `WITH ROLLUP`，将来会提供支持。详情参阅 [#4250](https://github.com/pingcap/tidb/issues/4250)。
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2 changes: 1 addition & 1 deletion functions-and-operators/window-functions.md
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Expand Up @@ -7,7 +7,7 @@ aliases: ['/docs-cn/dev/functions-and-operators/window-functions/','/docs-cn/dev

TiDB 中窗口函数的使用方法与 MySQL 8.0 基本一致，详情可参见 [MySQL 窗口函数](https://dev.mysql.com/doc/refman/8.0/en/window-functions.html)。由于窗口函数会使用一些保留关键字，可能导致原先可以正常执行的 SQL 语句在升级 TiDB 后无法被解析语法，此时可以将 `tidb_enable_window_function` 设置为 `0`，该参数的默认值为 `1`。

TiDB 支持的窗口函数如下所示：
TiDB 支持除 `GROUP_CONCAT()` 和 `APPROX_PERCENTILE()` 以外的所有 [`GROUP BY` 聚合函数](aggregate-group-by-functions.md)。此外，TiDB 支持的其他窗口函数如下：
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| 函数名 | 功能描述 |
| :-------------- | :------------------------------------- |
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