根据Oracle数据库scott模式下的scott.emp表和dept表,完成下列操作.

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题目要求:根据Oracle数据库scott模式下的scott.emp表和dept表,完成下列操作。

(1)查询20号部门的所有员工信息。

select * from scott.emp where deptno = 20;

(2)查询所有工种为CLERK的员工的工号、员工名和部门名。

select scott.empno,ename,deptno from scott.emp where job like'CLERK';

(3)查询奖金(COMM)高于工资(SAL)的员工信息。

select * from scott.emp where comm > sal;

(4)查询奖金高于工资的20%的员工信息。

select * from scott.emp where comm > (sal*0.2);

(5)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 scott.emp

where (deptno = 10 and job like 'MANAGER') or (deptno = 20and job like 'CLERK');

(6)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 scott.emp where job not in ('MANAGER','CLERK')and sal >= 2000 ;

(7)查询有奖金的员工的不同工种。

select distinct job from scott.emp where comm is not null;

(8)查询所有员工工资和奖金的和。

select ename,(sal+nvl(comm,0)) salcomm from scott.emp;

(9)查询没有奖金或奖金低于100的员工信息。

select * from scott.emp where (comm is null or comm < 100);

(10)查询各月倒数第2天入职的员工信息。

select * from scott.emp where hiredate in (select(last_day(hiredate)-1) from scott.emp);

(11)查询员工工龄大于或等于10年的员工信息。

select * from scott.emp where (sysdate - hiredate)/365 >=10 ;

(12)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 upper(substr(ename,1,1)) || lower(substr(ename,2,length(ename)-1))from scott.emp;

(13)查询员工名正好为6个字符的员工的信息。

select * from scott.emp where lengthename= 6 ;

(14)查询员工名字中不包含字母“S”员工。

select * from scott.emp where ename not in (select ename fromscott.emp where ename like '%S%') ;

select * from scott.emp where ename not like ‘%S%’;

(15)查询员工姓名的第2个字母为“M”的员工信息。

select * from scott.emp where ename like '_M%';

(16)查询所有员工姓名的前3个字符。

select substr(ename,3) from scott.emp ;

(17)查询所有员工的姓名,如果包含字母“s”,则用“S”替换。

select replace(ename,'s','S') from scott.emp ;

(18)查询员工的姓名和入职日期,并按入职日期从先到后进行排列。

select ename,hiredate from scott.emp order by hiredate asc ;

(19)显示所有的姓名、工种、工资和奖金,按工种降序排列,若工种相同则按工资升序排列。

select ename,job,sal,comm from scott.emp order by jobdesc,sal asc ;

(20)显示所有员工的姓名、入职的年份和月份,若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。

selectename,to_char(hiredate,'yyyy')||'-'||to_char(hiredate,'mm') from scott.emporder by to_char(hiredate,'mm'),'yyyy');

(21)查询在2月份入职的所有员工信息。

select * from scott.emp where to_char(hiredate,'mm') = 2 ;

(22)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 ename,floor((sysdate-hiredate)/365)||''||floor(mod((sysdate-hiredate),365)/30)||''||cell(mod(mod((sysdate-hiredate),365),30))||'' from scott.emp;

(23)查询至少有一个员工的部门信息。

select * from dept where deptno in (select distinct deptnofrom scott.emp where mgr is not null) ;

(24)查询工资比SMITH员工工资高的所有员工信息。

select * from scott.emp where sal > (select sal from scott.empwhere ename like 'SMITH') ;

(25)查询所有员工的姓名及其直接上级的姓名。

select staname,ename supname from (select ename staname,mgrfrom scott.emp) t join scott.emp on t.mgr=scott.emp.scott.empno ;

(26)查询入职日期早于其直接上级领导的所有员工信息。

select * from scott.emp where scott.empno in (select stascott.empnofrom (select scott.empno stascott.empno,hiredate stahiredate,mgr from scott.emp)t join scott.emp on t.mgr=scott.emp.scott.empno and stahiredate < hiredate);

(27)查询所有部门及其员工信息,包括那些没有员工的部门。

select * from dept left join scott.emp on scott.emp.deptno=dept.deptnoorder by dept.deptno ;

(28)查询所有员工及其部门信息,包括那些还不属于任何部门的员工。

(29)查询所有工种为CLERK的员工的姓名及其部门名称

select ename,dname from scott.emp join dept on job like'CLERK' and scott.emp.deptno=dept.deptno;

(30)查询最低工资大于2500的各种工作。

select job from (select min(sal) min_sal,job from scott.empgroup by job) where min_sal > 2500 ;

(31)查询最低工资低于2000的部门及其员工信息。

select * from scott.emp where deptno in (select deptno from(select min(sal) min_sal,deptno from scott.emp group by deptno) where min_sal< '2000') ;

(32)查询在SALES部门工作的员工的姓名信息。

select ename from scott.emp where deptno = (select deptnofrom dept where dname like 'SALES');

(33)查询工资高于公司平均工资的所有员工信息。

select * from scott.emp where sal > (select avg(sal) from scott.emp);

(34)查询与SMITH员工从事相同工作的所有员工信息。

select * from scott.emp where job in (select job from scott.empwhere ename like 'SMITH') and ename not like 'SMITH' ;

(35)列出工资等于30号部门中某个员工工资的所有员工的姓名和工资。

select ename,sal from scott.emp where sal =any (select salfrom scott.emp where deptno = 30) ;

(36)查询工资高于30号部门中工作的所有员工的工资的员工姓名和工资。

select ename,sal from scott.emp where sal >all (select salfrom scott.emp where deptno = 30) ;

(37)查询每个部门中的员工数量、平均工资和平均工作年限。

select dname,count,avg_sal,avg_date from dept join (selectcount(*) count,avg(sal) avg_sal,avg((sysdate-hiredate)/365) avg_date,deptnofrom scott.emp group by deptno) t on dept.deptno = t.deptno ;

(38)查询从事同一种工作但不属于同一部门的员工信息。

select distinct t1.scott.empno,t1.ename,t1.deptno from scott.empt1 join scott.emp t2 on t1.job like t2.job and t1.deptno <> t2.deptno ;

(39)查询各个部门的详细信息以及部门人数、部门平均工资。

Select dept.*,person_num,avg_sal from dept,(select count(*)person_num,deptno from scott.emp group by deptno) t wheredept.deptno = t.deptno ;

(40)查询各种工作的最低工资。

select job,min(sal) from scott.emp group by job ;

(41)查询各个部门中的不同工种的最高工资。

select max(sal),deptno from scott.emp group by deptno,joborder by deptno,job

(42)查询10号部门员工以及领导的信息。

select * from scott.emp where scott.empno in (select mgr fromscott.emp where deptno=10) or deptno = 10

(43)查询各个部门的人数及平均工资。

select deptno,count(*),avg(sal) from scott.emp group bydeptno

(44)查询工资为某个部门平均工资的员工信息。

select * from scott.emp where sal in (select avg(sal) avg_salfrom scott.emp group by deptno) ;

(45)查询工资高于本部门平均工资的员工的信息。

select scott.emp.* from scott.emp join (selectdeptno,avg(sal) avg_sal from scott.emp group by deptno) t on scott.emp.deptno=t.deptnoand sal>avg_sal ;

(46)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 scott.emp.*,avg_sal from scott.emp join (selectdeptno,avg(sal) avg_sal from scott.emp group by deptno) t on scott.emp.deptno=t.deptnoand sal>avg_sal ;

(47)查询工资高于20号部门某个员工工资的员工的信息。

select * from scott.emp where sal >any(select sal from scott.empwhere deptno=20);

(48)统计各个工种的人数与平均工资。

select job,avg(sal) from scott.emp group by job ;

(49)统计每个部门中各个工种的人数与平均工资。

select deptno,avg(sal) from scott.emp group bydeptno,job order by deptno,job;

(50)查询工资、奖金与10 号部门某个员工工资、奖金都相同的员工的信息。

select scott.emp.* from scott.emp join (select sal,comm from scott.empwhere deptno = 10) t on scott.emp.sal=t.sal and nvl(scott.emp.comm,0)=nvl(t.comm,0)and scott.emp.deptno != 10;

(51)查询部门人数大于5的部门的员工的信息。

select * from scott.emp where deptno in (select deptno from scott.empgroup by deptno having count(*)>5);

(52)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 distinct deptnofrom scott.emp where deptno not in (select distinct deptno from scott.emp wheresal < 1000)) ;

(53)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 scott.emp join dept on dept.deptno in (selectdistinct deptno from scott.emp where deptno not in (select distinct deptno fromscott.emp where sal < 1000)) and dept.deptno=scott.emp.deptno;

(54)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 in (select distinct deptnofrom scott.emp where deptno not in (select distinct deptno from scott.emp wheresal not between 900 and 3000)) ;

(55)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 scott.emp where deptno in (select distinctdeptno from scott.emp where deptno not in (select distinct deptno from scott.empwhere sal not between 900 and 3000)) ;

(56)查询每个员工的领导所在部门的信息。

select * from (select e1.scott.empno,e1.ename,e1.mgrmno,e2.ename mname,e2.deptno from scott.emp e1 join scott.emp e2 on e1.mgr=e2.scott.empno)t join dept on t.deptno=dept.deptno ;

(57)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 scott.emp group by deptno) where count in(select max(count) from (select count(*) count,deptno from scott.emp group bydeptno)));

(58)查询30号部门中工资排序前3名的员工信息。

select * from scott.emp where scott.empno in (select scott.empnofrom (select scott.empno,sal from scott.emp where deptno=30 order by sal desc)where rownum < 4) ;

(59)查询所有员工中工资排在5~10名之间的员工信息。

select * from scott.emp where scott.empno in (select scott.empnofrom (select scott.empno,rownum num from (select scott.empno,sal from scott.emporder by sal desc)) where num between 5 and 10 ) ;

select scott.empno from (select scott.empno,sal from scott.emporder by sal desc) where rownum <= 10 minus select scott.empno from (select scott.empno,salfrom scott.emp order by sal desc) where rownum < 5 ;

(60)查询SMITH员工及所有其直接、间接下属员工的信息。

(61)查询SOCTT员工及其直接、间接上级员工的信息。

(62)以树状结构查询所有员工与领导之间的层次关系。

(63)向scott.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。

insertinto scott.emp(scott.empno,deptno,hiredate) values(1357,'oracle',2050,20,to_date('2002510','yyyy""mm""dd""'));

(64)向scott.emp表中插入一条记录,员工名字为FAN,员工号为8000,其他信息与SMITH员工的信息相同。

(65)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 scott.emp t1 set sal = (select new_sal from (selectavg(sal)+1000 new_sal,deptno from scott.emp group by deptno) t2 wher et1.deptno = t2.deptno ) ;

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