sql查询练习题含答案_sql查询练习题及答案

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--(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(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(e.comm,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

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,--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。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.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 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 sal

--(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 on d.deptno in(select deptno from emp where deptno not in

(select distinct deptno from emp where sal

--(24)查询所有员工工资都在900~3000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900~3000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

--(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 e start 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 e start with ename='SCOTT' connect by 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),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

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)rollback;select * from emp;

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