COVAR

Description

Syntax

double covar(x, y)

计算协方差, 即返回结果为: x和y的协方差。

example

1. mysql> select covar(x,y) from baseall;
2. +---------------------+
3. | covar(x, y)          |
4. +---------------------+
5. | 0.89442719099991586 |
6. +---------------------+
7. 1 row in set (0.21 sec)

keywords

COVAR