mysql 求最小值/最大值

 計算所有人最低工資和最高工資,需分別用到min()和max()函數。(請注意，MIN和MAX函數會忽略NULL值)

select min(sal) as min_sal , max(sal) as max_sal from emp;

　　結果：

+---------+---------+
| min_sal | max_sal |
+---------+---------+
|     880 |    5000 |
+---------+---------+
1 row in set

　　搜索每個部門的最低工資和最高工資，還可以使用group by

select deptno,min(sal) as min_sal , max(sal) as max_sal from emp group by deptno;