2022年sql查询练习题含答案 .pdf
-(1)查询 20 号部门的所有员工信息。select * from emp e where e.deptno=20; -(2)查询奖金( COMM )高于工资(SAL)的员工信息。select * from emp where commsal; -(3)查询奖金高于工资的20%的员工信息。select * from emp where commsal*0.2; -(4)查询 10 号部门中工种为MANAGER和 20 号部门中工种为CLERK 的员工的信息。select * from emp e where (e.deptno=10 and e.job=MANAGER) or (e.deptno=20 and e.job=CLERK) -(5)查询所有工种不是MANAGER和 CLERK ,-且工资大于或等于2000 的员工的详细信息。select * from emp where job not in(MANAGER,CLERK) and sal=2000; -(6)查询有奖金的员工的不同工种。select * from emp where comm is not null; -(7)查询所有员工工资和奖金的和。select (e.sal+nvl(m,0) from emp e; -(8)查询没有奖金或奖金低于100 的员工信息。select * from emp where comm is null or comm=10; -(10) 查询员工信息,要求以首字母大写的方式显示所有员工的姓名。select initcap(ename) from emp; select upper(substr(ename,1,1)|lower(substr(ename,2) from emp; -(11) 显示所有员工的姓名、入职的年份和月份,按入职日期所在的月份排序,-若月份相同则按入职的年份排序。select ename,to_char(hiredate,yyyy) year,to_char(hiredate,MM) month from emp order by month,year; -(12) 查询在 2 月份入职的所有员工信息。select * from emp where to_char(hiredate,MM)=02 -(13) 查询所有员工入职以来的工作期限,用“* 年* 月* 日”的形式表示。select e.ename,floor(sysdate-e.hiredate)/365)|年 |floor(mod(sysdate-e.hiredate),365)/30)| 月 |floor(mod(mod(sysdate-e.hiredate),365),30)| 日 from emp e; -(14) 查询从事同一种工作但不属于同一部门的员工信息。名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页,共 6 页 - - - - - - - - - select a.ename,a.job,a.deptno,b.ename,b.job,b.deptno from emp a,emp b where a.job=b.job and a.deptnob.deptno; -(15) 查询各个部门的详细信息以及部门人数、部门平均工资。select d.deptno,count(e.empno),avg(e.sal),d.dname,d.loc from emp e ,dept d where e.deptno=d.deptno group by d.deptno,d.dname,d.loc -(16) 查询 10 号部门员工以及领导的信息。select * from emp where empno in( select mgr from emp where deptno=10) or deptno=10; -(17) 查询工资为某个部门平均工资的员工信息。select * from emp where sal in(select avg(sal) from emp group by deptno); -(18) 查询工资高于本部门平均工资的员工的信息。select * from emp e1 where sal (select avg(sal) from emp e2 where e2.deptno=e1.deptno); -(19) 查询工资高于本部门平均工资的员工的信息及其部门的平均工资。select e.*,a.avgsal from emp e, (select deptno,avg(sal) as avgsal from emp group by deptno) a where a.deptno=e.deptno and e.sala.avgsal; -(20) 统计各个工种的人数与平均工资。select count(*),e.job,avg(e.sal) from emp e group by e.job -(21) 统计每个部门中各个工种的人数与平均工资。select deptno,job,count(empno),avg(sal) from emp e group by e.deptno,e.job -(22) 查询所有员工工资都大于1000 的部门的信息。select * from dept where deptno in (select deptno from emp where deptno not in (select distinct deptno from emp where sal1000); -(23) 查询所有员工工资都大于1000 的部门的信息及其员工信息。select * from emp e join dept d 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页,共 6 页 - - - - - - - - - on d.deptno in (select deptno from emp where deptno not in (select distinct deptno from emp where sal1000) and d.deptno=e.deptno; -(24) 查询所有员工工资都在9003000 之间的部门的信息。select * from dept where deptno not in( select deptno from emp where sal not between 900 and 3000); -(25) 查询所有工资都在9003000 之间的员工所在部门的员工信息。select * from emp a where a.deptno in (select distinct e.deptno from emp e where e.sal between 900 and 3000); -(26) 查询每个员工的领导所在部门的信息。select d.* from dept d where d.deptno in (select distinct e2.deptno from emp e1,emp e2 where e1.empno=e2.mgr); -(27) 查询人数最多的部门信息。select * from dept where deptno in (select deptno from (select count(*) count,deptno from emp group by deptno) where count in(select max(count) from (select count(*) count ,deptno from emp group by deptno); -(28) 查询 30 号部门中工资排序前3 名的员工信息。select * from (select sal from emp where deptno=30 order by sal desc) e where rownum),3),level from emp start with mgr is null connect by prior empno=mgr; -(32)向 emp 表中插入一条记录,员工号为1357,员工名字为oracle,-工资为 2050 元,部门号为20,入职日期为2002 年 5 月 10 日。-(33)将各部门员工的工资修改为该员工所在部门平均工资加1000。update emp e set sal= 1000+(select avg(sal) from emp where deptno=e.deptno); -(34)查询工作等级为2 级, 1985 年以后入职的工作地点为DALLAS的员工编号、-姓名和工资。select e.ename,e.empno,e.sal from emp e,salgrade s,dept d where (e.sal between s.losal and s.hisal) and (s.grade=2) and to_char(e.hiredate,yyyy)1985 and e.deptno=d.deptno and d.loc=DALLAS; -35.部门平均薪水最高的部门编号select * from( select avg(sal) avgsal,deptno from emp group by deptno order by avgsal desc) where rownum=1; select deptno,avg(sal) from emp group by deptno having avg(sal)=( select max(avg(sal) avgsal from emp group by deptno) -36,部门平均薪水最高的部门名称select d.* from dept d where deptno in( select deptno from emp group by deptno having avg(sal)=( select max(avg(sal) avgsal from emp group by deptno) -37.平均薪水最低的部门的部门名称名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页,共 6 页 - - - - - - - - - select d.* from dept d where deptno in( select deptno from emp group by deptno having avg(sal)=( select min(avg(sal) avgsal from emp group by deptno) -38.平均薪水等级最低的部门的部门名称select d.dname from dept d where d.deptno in (select a.deptno from (select e.deptno from emp e,salgrade s where (e.sal between s.losal and s.hisal) group by e.deptno order by avg(s.grade) a where rownum=1); -39.部门经理人中,薪水最低的部门名称select dname from dept where deptno= (select deptno from (select deptno from emp where job=MANAGER group by deptno order by min(sal) where rownum=1) -40.比普通员工的最高薪水还要高的经理人名称select ename from emp where sal (select max(sal) from emp where job not in (MANAGER,PRESIDENT) and job=MANAGER or job=PRESIDENT -41.删除重复部门,但是留下一项insert into dept values(70,RESEARCH,DALLAS) select deptno,dname,rowid from dept delete from dept d where rowid (select min(rowid) from dept where dname=d.dname and d.loc=loc) -42.更新员工工资为他的主管的工资,奖金update emp e set sal=(select sal from emp where empno=e.mgr), comm=(select comm from emp where empno=e.mgr) update emp e set (sal,comm)=(select sal,comm from emp where empno=e.mgr) 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页,共 6 页 - - - - - - - - - rollback; select * from emp; 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页,共 6 页 - - - - - - - - -