sql查询练习题含答案

1、-（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 comm>sal;-（3）查询奖金高于工资的20%的员工信息。select * from emp where comm>sal*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 (

2、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1

3、00的员工信息。select * from emp where comm is null or comm<100;-（9）查询员工工龄大于或等于10年的员工信息。select * from emp where (sysdate-hiredate)/365>=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

4、，-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 emporder 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)/36

5、5)|'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。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.deptno<>b.deptno; -（15）查询各个部门的详细信息以及部门人数

6、、部门平均工资。select d.deptno,count(e.empno),avg(e.sal),d.dname,d.loc from emp e ,dept dwhere e.deptno=d.deptnogroup 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 empwhere sal in(selec

7、t 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) awhere a.deptno=e.dept

8、no and e.sal>a.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 egroup 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 empwhere deptno no

9、t in (select distinct deptno from emp where sal<1000);-（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 don d.deptnoin (select deptno from empwhere deptno not in (select distinct deptno from emp where sal<1000)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

10、 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 awhere 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 dwhere d.deptno in(select distinct

11、 e2.deptno from emp e1,emp e2where e1.empno=e2.mgr);-（27）查询人数最多的部门信息。select * from deptwhere 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。se

12、lect * from (select sal from emp where deptno=30 order by sal desc) ewhere rownum<4-（29）查询'JONES'员工及所有其直接、间接下属员工的信息。select e.* from emp estart with ename='JONES'connect by prior empno=mgr;-（30）查询SCOTT员工及其直接、间接上级员工的信息。select e.* from emp estart with ename='SCOTT'connect by

13、prior mgr=empno;-（31）以树状结构查询所有员工与领导之间的层次关系。select substr(sys_connect_by_path(ename,'->'),3),levelfrom empstart with mgr is nullconnect 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+(se

14、lect 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 dwhere (e.sal between s.losal and s.hisal) and (s.grade=2) and to_char(e.hiredate,'yyyy')>1985and e.deptno=d.deptnoand d.loc='DALLAS&#

15、39;-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 deptn

16、o 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 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

17、部门名称select d.dname from dept dwhere 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) awhere 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 fr

18、om emp where job='MANAGER' group by deptnoorder 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 deptdelete from dept dwhere rowid<>(select min(rowid) fro