时间:2021-07-01 10:21:17 帮助过:26人阅读
无详细内容 无 --1列出emp表中各部门的部门号,最高工资,最低工资--先分组,后计算,SELECT e.deptno AS 部门号, MAX(e.sal) AS 最高工资, MIN(e.sal) AS 最低工资 FROM emp AS e GROUP BY e.deptno;--2 列出emp表中各部门job为'CLERK'的员工的最低工资,最
<无详细内容> <无>
--1列出emp表中各部门的部门号,最高工资,最低工资 --先分组,后计算, SELECT e.deptno AS 部门号, MAX(e.sal) AS 最高工资, MIN(e.sal) AS 最低工资 FROM emp AS e GROUP BY e.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 MIN(e.sal) AS 最低工资 , MAX(e.sal) FROM emp AS e WHERE e.job='CLERK' GROUP BY e.deptno; --3 对于emp中最低工资小于2000的部门,列出job为'CLERK'的员工的部门号,最低工资,最高工资 SELECT e.deptno AS 部门号, MIN(e.sal) AS 最低工资 , MAX(e.sal) AS 最高工资 FROM emp AS e WHERE e.job ='CLERK' AND (SELECT MIN(b.sal) FROM emp b) <2000 GROUP BY e.deptno; --4 根据部门号由高而低,工资有低而高列出每个员工的姓名,部门号,工资 SELECT e.ename AS 姓名 ,e.deptno AS 部门号, e.sal AS 工资 FROM emp AS e ORDER BY e.deptno DESC ,e.sal --5 列出'buddy'所在部门中每个员工的姓名与部门号 SELECT e.ename AS 姓名, e.deptno AS 部门号 FROM emp AS e WHERE e.deptno =(SELECT b.deptno FROM emp AS b WHERE b.ename='buddy'); --6 列出每个员工的姓名,工作,部门号,部门名 SELECT e.ename 姓名, e.job AS 工作 , e.deptno AS 部门号 FROM emp AS e , dept AS d WHERE e.deptno=d.deptno ; --7列出emp中工作为'CLERK'的员工的姓名,工作,部门号,部门名 SELECT e.ename AS 姓名, e.job AS 工作 ,d.dname AS 部门名 FROM emp AS e , dept AS d WHERE e.deptno =d.deptno AND e.job='CLERK'; --8对于emp中有管理者的员工,列出姓名,管理者姓名(管理者外键为mgr) SELECT a.deptno AS 部门号,a.ename AS 员工,b.ename AS 管理者 FROM emp AS a,emp AS b WHERE a.mgr IS NOT NULL AND a.mgr=b.ename; --9 对于dept表中,列出所有部门名,部门号,同时列出各部门工作为'CLERK'的员工名与工作 SELECT d.dname AS 部门名, d.deptno AS 部门号 ,e.ename AS 姓名 , e.job AS 工作 FROM dept AS d ,emp AS e WHERE e.deptno =d.deptno AND e.job='CLERK'; --10 对于工资高于本部门平均水平的员工,列出部门号,姓名,工资,按部门号排序 SELECT e.deptno AS 部门号,e.ename AS 姓名, e.sal AS 工资 FROM emp AS e WHERE e.sal >(SELECT AVG(el.sal) FROM emp AS el WHERE el.deptno=e.deptno) ORDER BY e.deptno; --11对于emp,列出各个部门中工资高于本部门平均工资的员工数和部门号,按部门号排序 SELECT COUNT(e.sal) AS 员工数,e.deptno AS 部门号 FROM emp AS e WHERE e.sal >(SELECT AVG(el.sal) FROM emp AS el WHERE e.deptno =el.deptno) GROUP BY e.deptno ORDER BY e.deptno; --12对于emp中工资高于本部门平均水平,人数多与1人的,列出部门号,人数,平均工资,按部门号排序 SELECT COUNT(a.empno) AS 员工数,a.deptno AS 部门号,AVG(sal) AS 平均工资 FROM emp AS a WHERE (SELECT COUNT(c.empno) FROM emp AS c WHERE c.deptno=a.deptno AND c.sal>(SELECT AVG(sal) FROM emp AS b WHERE c.deptno=b.deptno))>1 GROUP BY a.deptno ORDER BY a.deptno;