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Oracle查询语句面试题

程序员文章站 2024-02-17 16:57:34
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Oracle查询语句面试题

01. 查询员工表所有数据,并说明使用*的缺点 select * from emp; 01.查询职(job)为

查询员工表所有数据,并说明使用*的缺点

select * from emp;

查询职(job)为'PRESIDENT'的员工的工资

select sal from emp where job='PRESIDENT';

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02.查询佣金为0或为null的员工的信息

select * from emp where comm is null or comm=1;

03.查询入职日期在1981-5-1到1981-12-31之间的所有员工的信息

select * from emp where hiredate between to_date(‘1-5月-81’) and to_date(‘31-12月-81’)

04..查询所有名字长度为4的员工的员工的编号,姓名

select empno,ename from emp where length(ename)=4

05.显示10号部门饿所有经理和20号部门的所有员工

select * from emp where job='MANAGER' and deptno=10 or job='CLERK' and deptno=20;

06.显示姓名没有'L'字的员工的详细信息或含有'SM'字的员工信息

select * from emp where ename not like '%L%' or ename like '%SM%';

07.显示各个部门经理的工资

select deptno,sal from emp where job='MANAGER';

08.显示佣金收入比工资高的员工的详细信息

select * from emp where comm>sal;

10.把hiredate列看做是员工的生日,求本月过生日的员工:

SQL> select * from emp
where to_char(hiredate,'mm')=to_char(sysdate,'mm');

11.把hiredate列看做是员工的生日,求下月过生日的员工

SQL> select * from emp
where to_char(hiredate,'mm')=to_char(add_months(sysdate,1),'mm');

12.求1982年入职的员工

SQL> select * from emp where to_char(hiredate,'yyyy')='1982';

hiredate是date类型的,1982是字符串类型的,类型匹配才可以

13.求1981年下半年入职的员工

select * from emp
where hiredate between to_date('1981-7-1','yyyy-mm-dd')
and to_date('1982-1-1','yyyy-mm-dd')-1;

注:to_char()函数和to_date()函数

to_char()函数是把日期的类型转换为指定的格式

to_date()是把字符串转换为日期类型

-1的原因是更精确

14.求1981年各个月入职的员工个数

SQL> select to_char(hiredate,'mm'),count(*) from emp where to_char(hiredate,'yyyy')='1981' group by to_char(hiredate,'mm') order by to_char(hiredate,'mm');

select to_char(hiredate,'mm'),count(*) from emp where to_char(hiredate,'yyyy')='1981' group by to_char(hiredate,'mm') order by to_char(hiredate,'mm');

PartII

01 .查询各个部门的平均工资

SQL> select deptno,avg(nvl(sal,0)) from emp group by deptno;

02.显示各种职位的最低工资

SQL> select job,min(sal) from emp group by job;

03.按照入职日期由新到旧排列员工信息

SQL> select hiredate from emp order by hiredate desc;

04.查询员工的基本信息,附加其上级的姓名(自关联)

SQL> select e.*,e1.ename from emp e,emp e1 where e.mgr=e1.empno;

05.显示工资比’ALLEN’高的所有员工的姓名和工作

SQL> select ename,sal from emp where sal>(select sal from emp where ename='ALLEN');

06.显示与scott从事相同工作的员工的信息(子查询)

SQL> select * from emp where job=(select job from emp where ename='SCOTT');

07.显示销售部(‘SALES’)员工的姓名

SQL> select e.ename from emp e inner join dept d on e.deptno=d.deptno where d.dname='SALES';

08.显示与30号门’MARTIN’员工工资相同的员工的姓名和工资

SQL> select ename,sal from emp where sal=(select sal from emp where deptno=30 and ename='MARTIN');

09.查询所有工资高于平均工资(包括所有员工)的销售人员

SQL> select * from emp where sal>(
select avg(sal) from emp) and job='SALESMAN';

SQL> select * from emp where job='SALESMAN' and sal>(select avg(sal) from emp);

10.显示所有职员的姓名及其所在部门的名称和工资(表连接)

SQL> select e.*,e.sal,d.dname from emp e inner join dept d on e.deptno=d.deptno;

11.查询在研发部(RESEARCH)工作人员的编号,姓名,,工作部门,工作所在地

SQL> select e.empno,e.ename,d.dname,d.loc from emp e inner join dept d on e.deptno=d.deptno where dname='RESEARCH';

12.查询各个部门的名称和员工人数

select e.deptno,d.dname,count(*) from emp e inner join dept d on e.deptno=d.deptno group by e.deptno,d.dname

分析:

SQL> select d.dname from emp e inner join dept d on e.deptno=d.deptno group by e.deptno,d.dname;
DNAME
--------------
ACCOUNTING
RESEARCH
SALES
SQL> select e.deptno,d.dname from emp e inner join dept d on e.deptno=d.deptno group by e.deptno,d.dname;
DEPTNO DNAME
------ --------------
10 ACCOUNTING
20 RESEARCH
30 SALES
SQL> select e.deptno,d.dname,count(*) from emp e inner join dept d on e.deptno=d.deptno group by e.deptno,d.dname;
DEPTNO DNAME COUNT(*)
------ -------------- ----------
10 ACCOUNTING 3

13.查询各个部门员工工资大于平均工资(平均工资包括所有员工)的人数和员工职位(子查询)

SQL> select count(*),job from emp where sal>(select avg(sal) from emp) group by job;

14.查询工资相同的员工的工资和姓名(子查询)

SQL> select sal,ename from emp e where(select count(*) from emp where sal=e.sal group by sal)>1;

SQL> select e.sal,e.ename from emp e,emp e1 where e.sal=e1.sal and e.ename<>e1.ename;

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