多表（难））
CREATE TABLE DEPT(DEPTNO INT PRIMARY KEY comment '部门id',
DNAME VARCHAR(14) comment '部门名称', -- 部门名称
LOC VARCHAR(13) comment '部门地址' -- 部门地址
)DEFAULt CHARSET=UTF8 ;
INSERT INTO DEPT VALUES (10,'ACCOUNTING','NEW YORK');
INSERT INTO DEPT VALUES (20,'RESEARCH','DALLAS');
INSERT INTO DEPT VALUES (30,'SALES','CHICAGO');
INSERT INTO DEPT VALUES (40,'OPERATIONS','BOSTON');
SELECT * FROM DEPT
CREATE TABLE EMP(
EMPNO INTPRIMARY KEY COMMENT '员工编号', -- 员工编号
ENAME VARCHAR(10) comment '员工姓名', -- 员工姓名
JOB VARCHAR(9) comment '员工工作', -- 员工工作
MGR INT comment '员工领导编号', -- 员工直属领导编号
HIREDATE DATE comment '入职时间', -- 入职时间
SAL DOUBLE comment '员工工资', -- 工资
COMM DOUBLE comment '奖金', -- 奖金
DEPTNO INT comment '部门id',-- 所在部门
FOREIGN KEY (DEPTNO) REFERENCES DEPT(DEPTNO))DEFAULTcharset=utf8;-- 关联dept表
-- ALTER TABLE EMP ADD FOREIGN KEY (DEPTNO) REFERENCES DEPT(DEPTNO);
INSERT INTO EMP VALUES(7369,'SMITH','职员',7566,"1980-12-17",800,NULL,20);
INSERT INTO EMP VALUES(7499,'ALLEN','销售员',7698,'1981-02-20',1600,300,30);
INSERT INTO EMP VALUES(7521,'WARD','销售员',7698,'1981-02-22',1250,500,30);
INSERT INTO EMP VALUES(7566,'JONES','经理',7839,'1981-04-02',2975,NULL,20);
INSERT INTO EMP VALUES(7654,'MARTIN','销售员',7698,'1981-09-28',1250,1400,30);
INSERT INTO EMP VALUES(7698,'BLAKE','经理',7839,'1981-05-01',2850,NULL,30);
INSERT INTO EMP VALUES(7782,'CLARK','经理',7839,'1981-06-09',2450,NULL,10);
INSERT INTO EMP VALUES(7788,'SCOTT','职员',7566,'1987-07-03',3000,2000,20);
INSERT INTO EMP VALUES(7839,'KING','董事长',NULL,'1981-11-17',5000,NULL,10);
INSERT INTO EMP VALUES(7844,'TURNERS','销售员',7698,'1981-09-08',1500,50,30);
INSERT INTO EMP VALUES(7876,'ADAMS','职员',7566,'1987-07-13',1100,NULL,20);
INSERT INTO EMP VALUES(7900,'JAMES','职员',7698,'1981-12-03',1250,NULL,30);
INSERT INTO EMP VALUES(7902,'FORD','销售员',7566,'1981-12-03',3000,NULL,20);
INSERT INTO EMP VALUES(7934,'MILLER','职员',7782,'1981-01-23',1300,NULL,10);
select *
from emp;
drop table SAVEPOINT;
CREATE TABLE SALGRADE(
GRADE INT comment '员工等级',-- 等级
LOSAL DOUBLE comment '最低工资', -- 最低工资
HISAL DOUBLE comment '最高工资' )DEFAULT CHARSET=UTF8; -- 最高工资
INSERT INTO SALGRADE VALUES (1,500,1000);
INSERT INTO SALGRADE VALUES (2,1001,1500);
INSERT INTO SALGRADE VALUES (3,1501,2000);
INSERT INTO SALGRADE VALUES (4,2001,3000);
INSERT INTO SALGRADE VALUES (5,3001,9999);
单表题目：
#1、查找部门30中员工的详细信息。
select *
from EMP
where deptno like '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 empno,ename,deptno
from EMP
where JOB ='职员'
#3、检索出奖金多于基本工资的员工信息。
select *
from EMP
where COMM>SAL
#4、检索出奖金多于基本工资60%的员工信息。
select *
from EMP
where comm>sal*0.6
#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 (JOB='经理' and deptno='10') or (job='职员' and deptno='20');
#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 sal>2000
#7、找出获得奖金的员工的工作。（comm奖金）
select *
from EMP
where comm is not null
#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 ename like '______'
#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 asc
#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 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%'
多表查询答案
#1、返回拥有员工的部门名、部门号。
select DEPT.deptno,DEPT.dname
from DEPT
left join EMP
ON DEPT.deptno=EMP.deptno
where empno is not null group by deptno
#2、工资水平多于smith的员工信息。
select ename
from EMP
where sal>(select sal from EMP where ename='smith')
#3、返回员工和所属经理的姓名。
select a.ename,b.ename
from EMP as a
left join EMP as b
on a.mgr=b.empno;
#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 a.ename,b.ename
from EMP as a
left join EMP as b
on a.mgr=b.empno
where a.hiredate<b.hiredate
#5、返回员工姓名及其所在的部门名称。
select DEPT.deptno,EMP.ename
from DEPT
left join EMP
on DEPT.deptno=EMP.deptno;
#6、返回从事clerk工作的员工姓名和所在部门名称。(CLERK销售)
select DEPT.dname,EMP.ename
from DEPT
left 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 EMP.deptno ,min(sal)
from DEPT
left join EMP
on DEPT.deptno=EMP.deptno
group by EMP.deptno having min(sal)
#8、返回销售部(sales)所有员工的姓名。
select EMP.ename
from DEPT
left join EMP
on DEPT.deptno=EMP.deptno
where DEPT.dname='sales'
#9、返回工资水平多于平均工资的员工。
select EMP.ename
from DEPT
left join EMP
on DEPT.deptno=EMP.deptno
where sal>(select avg(sal) from EMP );
#10、返回与SCOTT从事同工作的员工。(职员)
select *
from EMP
where job=(select job from EMP where ename='SCOTT'
#11、返回与30部门员工工资水平相同的员工姓名与工资。
select EMP.ename,EMP.SAL
from EMP
where EMP.sal=(select EMP.sal from EMP where (EMP.deptno=10 and EMP.deptno=30) or (EMP.deptno=20 and EMP.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 EMP.sal>(select EMP.MAX(EMP.sal) from EMP where EMP.deptno=30);
#13、返回部门号、部门名、部门所在位置及其每个部门
select DEPT.dname,DEPT.deptno,DEPT.loc,count(EMP.empno)
from EMP
left join DEPT
on EMP.deptno=DEPT.deptno
group by EMP.deptno
#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
left join EMP
on DEPT.deptno=EMP.deptno;
#15、返回员工的详细信息。(包括部门名)
select EMP.*,DEPT.dname
from DEPT
left join EMP
on DEPT.deptno=EMP.deptno;
#16、返回员工工作及其从事此工作的最低工资。
select EMP.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 EMP.empno,EMP.ename, EMP.sal*12
from EMP
group by sal
#18、返回工资处于第四级别的员工的姓名。
select EMP.ename
from EMP
where sal between(select losal from SALGRADE where grade=4) and (select hisal from SALGRADE where 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 EMP.ename,DEPT.loc,min(sal),max(sal)
from DEPT
left join EMP
on DEPT.deptno=EMP.deptno
where sal between (select losal from SALGRADE where grade=2) and (select hisal from SALGRADE where grade =2)
#20.工资等级多于smith的员工信息。
select empno,ename,job,mgr,hiredate,sal,comm,deptno
from EMP,SALGRADE
where grade>(select grade from EMP,SALGRADE where sal>=losal and sal<=hisal and ename='smith')
group by empno
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