聚合函数与窗口函数
原文英文,约400词,阅读约需2分钟。发表于: 。To calculate the sum of salaries based on department ID using both aggregate and window functions in SQL, you can follow these steps. I'll provide examples for both approaches, along with...
在SQL中,聚合函数SUM()结合GROUP BY可以计算每个部门的工资总和,并返回每个部门一行。窗口函数SUM()结合PARTITION BY也能计算每个部门的总工资,但保留所有行。选择方法取决于是否需要汇总数据或保留所有行。