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904 B
904 B
'35; AVG Description '35;'35;' 35; Syntax
AVG([DISTINCT] expr)
Used to return the average value of the selected field
Optional field DISTINCT parameters can be used to return the weighted average
'35;'35; example
mysql> SELECT datetime, AVG(cost_time) FROM log_statis group by datetime;
+---------------------+--------------------+
"1. Article 124b; Article 124b; Article 124g (`cost u 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