Oracle的sql语句练习题含答案(二)Oracle_SQL练习题11.选择部门30中的所有员工.2.列出所有办事员(CLERK)的姓名,编号和部门编号.3.找出佣金高于薪金的员工.4.找出佣金高于薪金的60%的员工.5.找出部门10中所有经理(MANAGER)和部门20中所有办事员(CLERK)的详细资料.6.找出部门10中所有经理(MANAGER),部门20中所有办事员(CLERK),既不是经理又不是办事员但其薪金大于或等于2000的所有员工的详细资料.7.找出收取佣金的员工的不同工作.8.找出不收取佣金或收取的佣金低于100的员工.9.找出各月倒数第3天受雇的所有员工.10.找出早于12年前受雇的员工.11.以首字母大写的方式显示所有员工的姓名.12.显示正好为5个字符的员工的姓名.13.显示不带有"R"的员工的姓名.14.显示所有员工姓名的前三个字符.15.显示所有员工的姓名,用a替换所有"A"16.显示满10年服务年限的员工的姓名和受雇日期.17.显示员工的详细资料,按姓名排序.18.显示员工的姓名和受雇日期,根据其服务年限,将最老的员工排在最前面.19.显示所有员工的姓名、工作和薪金,按工作的降序排序,若工作相同则按薪金排序.20.显示所有员工的姓名、加入公司的年份和月份,按受雇日期所在月排序,若月份相同则将最早年份的员工排在最前面.21.显示在一个月为30天的情况所有员工的日薪金,忽略余数.22.找出在(任何年份的)2月受聘的所有员工。
23.对于每个员工,显示其加入公司的天数.24.显示姓名字段的任何位置包含"A"的所有员工的姓名.25.以年月日的方式显示所有员工的服务年限.答案:1.select ename,job,mgr,hiredate,sal,comm ,deptno from emp where deptno=30;2.select ename,empno,deptno from emp where job='CLERK';3.select * from emp where comm>sal;4.select *from empwhere comm>sal*0.6;5.select empno ,ename, job,hiredate,sal,comm,deptnofrom empwhere( job='MANAGER' and deptno=10)or( job='CLERK' and deptno=20);6.select empno,ename,job, hiredate,sal, deptnofrom empwhere ( job='MANAGER' and deptno=10)or( job='CLERK' and deptno=20)or((job <>'MANAGER' and job<>'CLERK') and sal>=2000);7.select distinct ename,job,commfrom empwhere NVL(comm,0)>0;注意如果像上面这样写,就job ename comm 3个同时不同的都列出来正确的是:select distinct jobfrom empwhere NVL(comm,0)>0;8.select ename,comm. from emp where NVL(comm,0)=0 or NVL(comm,0)<100; 如果按上面的写法就重复了,直接可以写成select ename,commfrom empwhere NVL(comm,0)<100;9 select ename, job,last_day(hiredate)-3from emp;select ename, job,hiredatefrom empwhere hiredate=last_day(hiredate)-2;10.select ename,jobfrom empwhere months_between(sysdate,hiredate)/12>1211.select initcap(ename) name ,job, hiredatefrom emp;12. select ename,job,hiredate from emp where length(ename)=5;13 select ename, job from emp where ename not like '%R%';14.select substr(ename, 1,3) name,job,hiredate from emp;15select replace(ename, 'A','a') name,job,hiredate from emp;16select ename, job, hiredate from empwhere months_between(sysdate,hiredate)/12>=10;17. select * from emp order by ename;18.select ename, hiredate from emp order by hiredate desc;19.select ename,job, sal from emp order by job desc, sal asc;20.select ename, to_char(hiredate,'yyyy') year, to_char(hiredate,'mm') monthsfrom emporder by months, year asc;21.select ename, sal/30 dailysalfrom emp;22. select ename, hiredatefrom empwhere to_char(hiredate,'mm')='02';23. select ename,sysdate-hiredate 天数from emp;24.select ename from emp where instr(ename,'A',1)>0;25. select ename, to_char(hiredate,'yyyy/mm/dd') from emp;--26.列出至少有一个员工的所有部门.select dname from emp,dept where emp.deptno=dept.deptno group by dname;select distinct dname from emp,dept where emp.deptno=dept.deptno;--说明:(1)select中出现的字段一定要出现在group by中;-- (2)如果select中出现的字段不出现在group by中,则一定要出现在select的聚合函数中,对于想出现的字段,可用max()或min()。
-- (3)默认的情况是按group by中的字段来排序,如果要用order by来自己排序,则order by后的字段一定是group by后的字段,不能是聚合函数的字段--27.列出薪金比“SMITH”多的所有员工.select ename, sal from emp where sal > (select sal from emp where upper(ename)='SMITH');--28.列出所有员工的姓名及其直接上级的姓名.select a.ename, b.ename mgrname from emp a,emp b where a.mgr = b.empno;--29.列出受雇日期早于其直接上级的所有员工select e.ename, m.ename from emp e, emp m where e.mgr=m.empno and (e.hiredate < m.hiredate ); 30.列出部门名称和这些部门的员工信息,同时列出那些没有员工的部门select dname, emp.* from dept, emp where emp.deptno(+) = dept.deptno order by dname;--说明:外连接(使一个都不能少,(+)对面的表里的字段都不能少)--31.列出所有“CLERK”(办事员)的姓名及其部门名称select distinct emp.ename, dept.deptno from emp, dept where emp.deptno = dept.deptno and upp er(emp.job)='CLERK';--32.列出最低薪金大于1500的各种工作select job from emp group by job having min(sal) > 1500;--33.列出在部门“SALES”(销售部)工作的员工的姓名,假定不知道销售部的部门编号select ename from emp, dept where emp.deptno = dept.deptno and dname = 'SALES';--34.列出薪金高于公司平均薪金的所有员工select ename, sal from emp where sal > (select avg(sal) from emp);--35.列出与“SCOTT”从事相同工作的所有员工--SCOTT从事一种工作select ename from emp where job = (select job from emp where upper(ename) = 'SCOTT');--SCOTT从事多种工作select ename, job from emp where job in (select job from emp where upper(ename) = 'SCOTT'); --36.列出薪金等于部门30中员工的薪金的所有员工的姓名和薪金select ename, sal from emp where sal in(select sal from emp where deptno = 30);--37.列出薪金高于在部门30工作的所有员工的薪金的员工姓名和薪金select ename, sal from emp where sal > (select max(sal) from emp where deptno = 30);--38.列出在每个部门工作的员工数量、平均工资和平均服务期限select deptno "部门号", count(ename) "员工数量", avg(sal + nvl(comm, 0)) "平均工资", trunc(avg(sysdate-hiredate)) "平均服务期限(天)"from emp group by deptno;--39.列出所有员工的姓名、部门名称和工资select ename, dname, sal+nvl(comm,0) from emp, dept where emp.deptno = dept.deptno;--40.列出从事同一种工作但属于不同部门的员工的一种组合select distinct e.deptno, e.job from emp e, emp m where e.deptno != m.deptno and e.job = m.job o rder by e.job;--41.列出所有部门的详细信息和部门人数select dept.*, (select count(ename) from emp where emp.deptno(+)=dept.deptno) 人数 from dept;--42.列出各种工作的最低工资select job, min(sal + nvl(comm, 0)) "最低工资" from emp group by job;--43.列出各个部门的MANAGER(经理)的最低薪金select min(sal + nvl(comm,0)) from emp where upper(job) = 'MANAGER' group by deptno;--显示部门名称select dname, min(sal + nvl(comm,0)) from emp, dept where emp.deptno = dept.deptno and upper (job) = 'MANAGER' group by dname;--44.列出所有员工的年工资,按年薪从低到高排序select ename, to_char((sal+nvl(comm,0))*12, '9999,9999.00') "年工资" from emp order by 2;--45.显示各部门员工薪金最高的前2名select * from (select ename, deptno, sal, row_number() over(partition by deptno order by sal desc ) r from emp ) where r <=2--46.显示薪金最高的3位员工select * from (select ename, sal,dense_rank() over(order by sal desc) r from emp) where r <=3;--47.创建表myemp和emp表具有相同的结构和记录。