三表+多表题。3.14作业
1.
select A.sname,B.grade
from A
left join B
on A.sid = B.sid
left join C
on B.sid = C.cid
where grade >60
2.
select A.sname,C.teacher
from A
left join B
on A.sid = B.sid
left join C
on B.cid = C.cid
where A.sname like '%ny'
3.
select A.sid,C.cname
from A
left join B
on A.sid = B.sid
left join C
on B.cid = C.cid
where cname = 'Maths'
4.
select A.sid
from A
left join B
onA.sid = B.sid
left join C
on B.cid = C.cid
where (C.cid='C2') or (C.cid='C4')
5.
select A.sname,A.sid
from A
left join B
on A.sid = B.sid
left join C
on B.sid = C.cid
where grade = null
6.
select A.sname
from A
left join B
on A.sid = B.sid
left join C
on B.sid = C.cid
where B.grade > 79
7.
select A.sname,C.cname
from A
left join B
on A.sid = B.sid
left join C
on B.cid = C.cid
where B.grade < 60
8.
select max(grade),C.cname,C.teacher
from A
left join B
on A.sid = B.sid
left join C
on B.cid = C.cid
where A.sname = 'dany'
9.
select avg(grade),C.cname
from A
left join B
on A.sid = B.sid
left join C
on B.cid = C.cid
group by C.cname;
10,
update B set grade=60 where B.sid=1113
11,
select distinct(A.sid),A.sname
from A
left join B
on A.sid=B.sid
left join C
on B.cid=C.cid;
12
select count(C.cname),C.cname
from A
left join B
on A.sid = B.sid
left join C
on B.cid = C.cid
where A.sname='tom'
13,
alter table A add class int(5);
14,
insert into C(cid,cname,teacher)values('C5','painting','baixue');
15,
delete from C where cid='c1';
16,
select C.teacher,C.cname
from A
left join B
on A.sid=B.sid
left join C
on B.cid=C.cid
where A.sname='TOM'
17.
select avg(B.grade),A.sname
from A
left join B
on A.sid=B.sid
left join C
on B.cid=C.cid
group by B.grade desc;
18.
select C.cname,A.sname
from A
left join B
on A.sid=B.sid
left join C
on B.cid=C.cid
where C.teacher='zhangsan';
单表题目:
#1、查找部门30中员工的详细信息。
select *
from emp
where deptno = 30
#2、找出从事职员工作的员工的编号、姓名、部门号。(clerk职员,办事员)
select ename,deptno,empno,job
from emp
where job = '职员' or '办事员'
#3、检索出奖金多于基本工资的员工信息。
losal 最低工资COMM 佣金
empno 员工编号
HISAL 某一等级的最高工资最高工资最高值
select *
from emp
where sal >500
#4、检索出奖金多于基本工资60%的员工信息。
select *
from emp
where comm > 300
#5、找出10部门的经理、20部门的职员 的员工信息。(manager经理;管理
select *
from emp
where (deptno=10 and job='经理') or (deptno=20 and job='职员')
#6、找出10部门的经理、20部门的职员 或者既不是经理也不是职员但是工资高于2000元的员工信息。(sal 工资)
select *
from emp
where ((deptno=10 and job='经理') or (deptno=20 and job='职员'))
or (job!='经理' and job!='职员') and sal>2000
#7、找出获得奖金的员工的工作。(comm奖金)
select job,ename
from emp
where comm!=0
#8、找出奖金少于100或者没有获得奖金的员工的信息。
select *
from emp
where comm<100 or comm is null
#9、找出姓名以A、B、S开始的员工信息.
select *
from emp
where ename like ('A%') OR ename like ('B%')
OR ename like ('S%')
#10、找到名字长度为6个字符的员工信息。
select *
from emp
where length(6)
#11、名字中不包含R字符的员工信息。
select *
from emp
where ename not like '%R%'
#12、查找员工的详细信息并按姓名排序。
select *
from emp
order by ename desc
#13、返回员工的信息并按工作降序工资升序排列。(升序的规则)
select *
from emp
order by job desc,sal asc
#14、计算员工的日薪(按30天)。
select ename,sal/30
as daysal
from emp
#15、找出姓名中包含A的员工信息。
select *
from emp
where ename like '%A%'
1、返回拥有员工的部门名、部门号。
select dept.deptno,emp.empno
from dept
inner join emp on dept.deptno=emp.deptno
#2、工资水平多于smith的员工信息。
select *
from emp
where sal>800
#3、返回员工和所属经理的姓名。
select job,ename,deptno
from emp
where deptno!=40
#4、返回雇员的雇佣日期早于其经理雇佣日期的员工及其经理姓名。
select ename,job,hiredate
from emp
where (hiredate >'1980-12-17') and (job is not null)
#5、返回员工姓名及其所在的部门名称。
select deptno,ename
from emp
#6、返回从事clerk工作的员工姓名和所在部门名称。(CLERK销售)
select *
from dept
inner join emp
on dept.deptno=emp.deptno
where job='销售员'
#7、返回部门号及其本部门的最低工资。
select min(sal),deptno
from emp
group by deptno;
#8、返回销售部(sales)所有员工的姓名。
select emp.ename,emp.job
from emp
where emp.job='销售员'
#9、返回工资水平多于平均工资的员工。
select emp.ename,sal
from emp
where emp.sal>(select avg(sal) from emp )
#10、返回与SCOTT从事相同工作的员工。(职员)
select emp.ename,emp.job
from dept
left join emp
on dept.deptno=emp.deptno
where emp.ename='scott' or emp.job='职员'
#11、返回与30部门员工工资水平相同的员工姓名与工资。
select ename,sal
from emp
where sal in (select sal from emp where deptno=30)
#12、返回工资高于30部门所有员工工资水平的员工信息。
select *
from emp
where sal > (select max(sal) from emp where deptno=30)
#13、返回部门号、部门名、部门所在位置及其每个部门的工员总数。
select dept.deptno,dept.dname,dept.loc,count(emp.deptno)
from dept,emp
where dept.deptno=emp.deptno or emp.deptno is null
#14、返回员工的姓名、所在部门名及其工资。
select emp.ename,dept.dname,emp.sal
from dept,emp
where dept.deptno=emp.deptno;
#15、返回员工的详细信息。(包括部门名)
select emp.*,dept.dname
from emp,dept
where dept.deptno=emp.deptno;
#16、返回员工工作及其从事此工作的最低工资。
select job,min(sal)
from emp
group by job
#17、计算出员工的年薪,并且以年薪排序。
select ename,sal*12 as ysal
from emp
order by ysal;
#18、返回工资处于第四级别的员工的姓名。
select emp.ename,emp.sal
from emp,salgrade
where emp.sal<=3000 and emp.sal>=2001 and salgrade.grade=4;
#19、返回工资为二等级的职员名字、部门所在地、和二等级的最低工资和最高工资
select ename,loc,losal,hisal
from emp,dept,salgrade
where salgrade.grade=2 and sal<=1500 and sal>=1001
#20.工资等级多于smith的员工信息。
select grade
from salgrade
where losal<=(select sal from emp where ename='smith')
and hisal>=(select sal from emp where ename='smith');
页:
[1]