covar_samp

covar_samp介绍

covar_samp(expr1, expr2) - 返回一组数字对的样本协方差。

Examples:

> SELECT covar_samp(c1, c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1, c2);
 1.0

Since: 2.0.0