MySQL Group by 查询特定条件

Question

如果我想知道每个客户的工资总额，那么 GROUP BY 查询如下:

SELECT NAME, SUM(SALARY) FROM CUSTOMERS GROUP BY NAME;

但是，如果我不想要薪水总和，只需要查看按名称分组的所有薪水，那么查询或方法是什么？

Answer 1

这取决于你想显示的薪水..

选项 1 -> 最大值:

SELECT NAME, max(SALARY) FROM CUSTOMERS GROUP BY NAME;

选项 2 -> 最小值:

SELECT NAME, min(SALARY) FROM CUSTOMERS GROUP BY NAME;

选项 3 -> 它们的列表:

SELECT NAME, group_concat(SALARY separator ',') FROM CUSTOMERS GROUP BY NAME;

最后一个选项 -> 无关紧要:

SELECT NAME,SALARY FROM CUSTOMERS GROUP BY NAME;