COVAR_POP

返回一组数值对的总体协方差。

语法

COVAR_POP(<expr1>, <expr2>)

参数

别名

• VAR_POP
• VARIANCE_POP

返回类型

float64

示例

创建表并插入示例数据

CREATE TABLE product_sales (
  id INT,
  product_id INT,
  units_sold INT,
  revenue FLOAT
);

INSERT INTO product_sales (id, product_id, units_sold, revenue)
VALUES (1, 1, 10, 1000),
       (2, 2, 20, 2000),
       (3, 3, 30, 3000),
       (4, 4, 40, 4000),
       (5, 5, 50, 5000);

查询示例：计算销量与收入之间的总体协方差

SELECT COVAR_POP(units_sold, revenue) AS covar_pop_units_revenue
FROM product_sales;

结果

| covar_pop_units_revenue |
|-------------------------|
|        20000.0          |