cherry pick pingcap#4504 to release-3.0

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
ti-srebot · Sep 15, 2020 · 544c101 · 544c101
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commit 544c101
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diff --git a/functions-and-operators/aggregate-group-by-functions.md b/functions-and-operators/aggregate-group-by-functions.md
@@ -149,7 +149,6 @@ group by id, val;
 
 TiDB 目前不支持的聚合函数如下所示，相关进展参阅 [TiDB #7623](https://github.com/pingcap/tidb/issues/7623)。
 
-- `STD`, `STDDEV`, `STDDEV_POP`
 - `STDDEV_SAMP`
 - `VARIANCE`, `VAR_POP`
 - `VAR_SAMP`