1d9b3aeee7
The error format '##keyword' in a lot of docs. This pr is to repair document format. #4335
1.6 KiB
1.6 KiB
title, language
| title | language |
|---|---|
| AVG | zh-CN |
AVG
description
Syntax
AVG([DISTINCT] expr)
用于返回选中字段的平均值
可选字段DISTINCT参数可以用来返回去重平均值
example
mysql> SELECT datetime, AVG(cost_time) FROM log_statis group by datetime;
+---------------------+--------------------+
| datetime | avg(`cost_time`) |
+---------------------+--------------------+
| 2019-07-03 21:01:20 | 25.827794561933533 |
+---------------------+--------------------+
mysql> SELECT datetime, AVG(distinct cost_time) FROM log_statis group by datetime;
+---------------------+---------------------------+
| datetime | avg(DISTINCT `cost_time`) |
+---------------------+---------------------------+
| 2019-07-04 02:23:24 | 20.666666666666668 |
+---------------------+---------------------------+
keyword
AVG