爱站程序员基地CREATE TABLE emp(
empno INT,
ename VARCHAR(50),
job VARCHAR(50),
mgr INT,
hiredate DATE,
sal DECIMAL(7,2),
comm DECIMAL(7,2),
deptno INT
) ;
INSERT INTO emp VALUES(7369,‘SMITH’,‘CLERK’,7902,‘1980-12-17’,800,NULL,20);
INSERT INTO emp VALUES(7499,‘ALLEN’,‘SALESMAN’,7698,‘1981-02-20’,1600,300,30);
INSERT INTO emp VALUES(7521,‘WARD’,‘SALESMAN’,7698,‘1981-02-22’,1250,500,30);
INSERT INTO emp VALUES(7566,‘JONES’,‘MANAGER’,7839,‘1981-04-02’,2975,NULL,20);
INSERT INTO emp VALUES(7654,‘MARTIN’,‘SALESMAN’,7698,‘1981-09-28’,1250,1400,30);
INSERT INTO emp VALUES(7698,‘BLAKE’,‘MANAGER’,7839,‘1981-05-01’,2850,NULL,30);
INSERT INTO emp VALUES(7782,‘CLARK’,‘MANAGER’,7839,‘1981-06-09’,2450,NULL,10);
INSERT INTO emp VALUES(7788,‘SCOTT’,‘ANALYST’,7566,‘1987-04-19’,3000,NULL,20);
INSERT INTO emp VALUES(7839,‘KING’,‘PRESIDENT’,NULL,‘1981-11-17’,5000,NULL,10);
INSERT INTO emp VALUES(7844,‘TURNER’,‘SALESMAN’,7698,‘1981-09-08’,1500,0,30);
INSERT INTO emp VALUES(7876,‘ADAMS’,‘CLERK’,7788,‘1987-05-23’,1100,NULL,20);
INSERT INTO emp VALUES(7900,‘JAMES’,‘CLERK’,7698,‘1981-12-03’,950,NULL,30);
INSERT INTO emp VALUES(7902,‘FORD’,‘ANALYST’,7566,‘1981-12-03’,3000,NULL,20);
INSERT INTO emp VALUES(7934,‘MILLER’,‘CLERK’,7782,‘1982-01-23’,1300,NULL,10);
CREATE TABLE dept(
deptno INT,
dname VARCHAR(14),
loc VARCHAR(13)
);
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’);
– 查询出高于10号部门的平均工资的员工信息
SELECT * FROM emp e WHERE sal>(SELECT AVG(sal) FROM emp where deptno=10)
– 查询出比10号部门任何员工薪资高的员工信息
SELECT * from emp where sal>(SELECT max(sal) from emp where deptno=10)
– 和10号部门同名同工作的员工信息
SELECT * from emp where (ename,job) in(SELECT ename,job FROM emp where deptno=10) and deptno!=10;
– 获取员工的名字和部门的名字
SELECT ename,(SELECT dname from dept d where e.deptno=d.deptno) FROM emp e
– 查询emp表中经理信息
SELECT * FROM emp e,dept d WHERE e.job=‘manager’ and e.deptno=d.deptno
– 薪资高于10号部门平均工资的所有员工信息
SELECT * from emp where sal>(SELECT max(sal) from emp where deptno=10)
– 有哪些部门的平均工资高于30号部门的平均工资
SELECT deptno,AVG(sal) from emp GROUP BY deptno HAVING AVG(sal)>(SELECT AVG(sal) from emp where deptno=30)
– 工资>JONES工资
SELECT * from emp where sal>(SELECT sal from emp where ename=‘JONES’)
– 查询与SCOTT同一个部门的员工
SELECT * from emp where deptno=(SELECT deptno from emp where ename=‘scott’)
– 工资高于30号部门所有人的员工信息
SELECT * from emp where sal>(SELECT MAX(sal) from emp where deptno=30 )
– 查询工作和工资与MARTIN完全相同的员工信息
SELECT * from emp where (job,sal) in(SELECT job,sal from emp where ename=‘MARTIN’)
– 有两个以上直接下属的员工信息
SELECT *,COUNT(mgr) from emp GROUP BY mgr HAVING COUNT(mgr)>2
– 查询员工编号为7788的员工名称,员工工资,部门名称,部门地址
SELECT ename,sal,dname,loc from emp e,(SELECT * from dept) d where e.empno=7788 and e.deptno=d.deptno
