作者：Itzhipan 1 列出emp表中各部门的部门号，最高工资，最低工资 select max(sal) as 最高工资,min(sal) as 最低工资,deptno from emp group by deptno; 2 列出emp表中各部门job为'CLERK'的员工的最低工资，最高工资 select max(sal) as 最高工资,min(sal) as 最低工资,deptno as 部门号 from emp where job = 'CLERK' group by dept