STDDEV_POP
函数说明
STDDEV_POP(expr) 是一个聚合函数,计算总体标准差。
函数语法
> STDDEV_POP(expr)
参数释义
参数 | 说明 |
---|---|
expr | 任何数值类型的列的列名 |
示例
> CREATE TABLE t1(PlayerName VARCHAR(100) NOT NULL,RunScored INT NOT NULL,WicketsTaken INT NOT NULL);
> INSERT INTO t1 VALUES('KL Rahul', 52, 0 ),('Hardik Pandya', 30, 1 ),('Ravindra Jadeja', 18, 2 ),('Washington Sundar', 10, 1),('D Chahar', 11, 2 ), ('Mitchell Starc', 0, 3);
> SELECT STDDEV_POP(RunScored) as Pop_Standard_Deviation FROM t1;
> SELECT STDDEV_POP(WicketsTaken) as Pop_Std_Dev_Wickets FROM t1;
> SELECT STDDEV_POP(RunScored) as Pop_Standard_Deviation FROM t1;
+------------------------+
| Pop_Standard_Deviation |
+------------------------+
| 16.8762 |
+------------------------+
1 row in set (0.02 sec)
> SELECT STDDEV_POP(WicketsTaken) as Pop_Std_Dev_Wickets FROM t1;
+---------------------+
| Pop_Std_Dev_Wickets |
+---------------------+
| 0.9574 |
+---------------------+
1 row in set (0.01 sec)