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avg

Description​

Returns the average value of selected fields.

Optional field DISTINCT parameters can be used to return the weighted average.

Syntax​

AVG([DISTINCT] expr)

Examples​

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