目录
1 查询每个部门最高薪水的人员名称
2 查询哪些人的薪水在部门平均薪水之上
3 查询每个部门的平均薪水等级
3.1 每个部门的平均薪水的等级
3.2 每个部门的平均的薪水等级
4 查询最高薪水（不用max函数）
5 查询平均薪水最高的部门的部门编号
6 查询平均薪水最高的部门的部门名称
7 查询平均薪水的等级最低的部门的部门名称
8 查询比普通员工的最高薪水还要高的经理人姓名
9 查询薪水最高的前五名员工
10 查询薪水最高的第6-10名员工
11 查询最后入职的5名员工
12 查询每个薪水等级有多少员工
13 列出所有员工及领导名字
14 受雇日期早于其直接上级的所有员工编号、姓名、部门名称
15 列出部门名称和员工信息，同时列出没有员工的部门
16 列出至少5个员工的所有部门
17 列出薪水比“SMITH”多的所有员工信息
数据代码在文末。
1 查询每个部门最高薪水的人员名称
# （1）求出每个部门的最高薪水
select e.deptno,max(e.sal) maxsal from emp e
group by e.deptno;
+--------+---------+
| deptno | maxsal |
+--------+---------+
| 20 | 3000.00 |
| 30 | 2850.00 |
| 10 | 5000.00 |
+--------+---------+
# （2）将以上表当作一个临时表t，多表连接（join...on...）
select e.deptno,e.ename,t.maxsal,e.sal
from (select e.deptno,max(e.sal) as maxsal from emp e group by e.deptno) t
join emp e on e.deptno=t.deptno
where t.maxsal=e.sal
order by e.deptno;
+--------+-------+---------+---------+
| deptno | ename | maxsal | sal |
+--------+-------+---------+---------+
| 10 | KING | 5000.00 | 5000.00 |
| 20 | SCOTT | 3000.00 | 3000.00 |
| 20 | FORD | 3000.00 | 3000.00 |
| 30 | BLAKE | 2850.00 | 2850.00 |
+--------+-------+---------+---------+2 查询哪些人的薪水在部门平均薪水之上
# （1）部门平均薪水
select e.deptno,avg(sal) avgsal from emp e
group by deptno;
+--------+-------------+
| deptno | avgsal |
+--------+-------------+
| 20 | 2175.000000 |
| 30 | 1566.666667 |
| 10 | 2916.666667 |
+--------+-------------+
# （2）当作临时表t，多表连接（join...on...）
select t.deptno,e.ename
from (select e.deptno,avg(sal) avgsal from emp e group by e.deptno) t
join emp e on e.deptno=t.deptno
where e.sal>t.avgsal
order by t.deptno;
+--------+-------+
| deptno | ename |
+--------+-------+
| 10 | KING |
| 20 | JONES |
| 20 | SCOTT |
| 20 | FORD |
| 30 | ALLEN |
| 30 | BLAKE |
+--------+-------+3 查询每个部门的平均薪水等级
3.1 每个部门的平均薪水的等级
# （1）部门的平均薪水
select e.deptno,avg(e.sal) as avgsal
from emp e
group by e.deptno;
+--------+-------------+
| deptno | avgsal |
+--------+-------------+
| 20 | 2175.000000 |
| 30 | 1566.666667 |
| 10 | 2916.666667 |
+--------+-------------+
#（2）部门的薪水等级
select * from salgrade;
+-------+-------+-------+
| GRADE | LOSAL | HISAL |
+-------+-------+-------+
| 1 | 700 | 1200 |
| 2 | 1201 | 1400 |
| 3 | 1401 | 2000 |
| 4 | 2001 | 3000 |
| 5 | 3001 | 9999 |
+-------+-------+-------+
# （3）将临时表t与表salgrade进行连接,查询平均薪水在哪个等级范围中
select t.deptno,s.grade
from (select e.deptno,avg(e.sal) as avgsal from emp e group by e.deptno) t
join salgrade s
on t.avgsal between s.losal and s.hisal
order by t.deptno;
+--------+-------+
| deptno | grade |
+--------+-------+
| 10 | 4 |
| 20 | 4 |
| 30 | 3 |
+--------+-------+3.2 每个部门的平均的薪水等级
# （1）查询部门每个人的薪水等级在哪个等级范围中
select e.deptno,e.ename,s.grade
from emp e
join salgrade s
on e.sal between s.losal and s.hisal
order by e.deptno;
+--------+--------+-------+
| deptno | ename | grade |
+--------+--------+-------+
| 10 | CLARK | 4 |
| 10 | KING | 5 |
| 10 | MILLER | 2 |
| 20 | SMITH | 1 |
| 20 | JONES | 4 |
| 20 | SCOTT | 4 |
| 20 | ADAMS | 1 |
| 20 | FORD | 4 |
| 30 | ALLEN | 3 |
| 30 | WARD | 2 |
| 30 | MARTIN | 2 |
| 30 | BLAKE | 4 |
| 30 | TURNER | 3 |
| 30 | JAMES | 1 |
+--------+--------+-------+
# （2）将临时表t按每个部门的等级进行平均
select t.deptno,avg(t.grade) as avgGrade
from (select e.deptno,e.ename,s.grade from emp e
join salgrade s on e.sal between s.losal and s.hisal order by e.deptno) t
group by t.deptno;
+--------+----------+
| deptno | avgGrade |
+--------+----------+
| 20 | 2.8000 |
| 30 | 2.5000 |
| 10 | 3.6667 |
+--------+----------+4 查询最高薪水（不用max函数）
# 第一种方法
select sal from emp
order by sal desc
limit 1;
+---------+
| sal |
+---------+
| 5000.00 |
+---------+
# 第二种方法
# （1）将两张一样的表进行比较，并且清除重复值
select distinct a.sal
from emp a
join emp b
on a.sal<b.sal;
+---------+
| sal |
+---------+
| 1300.00 |
| 950.00 |
| 1100.00 |
| 1500.00 |
| 1250.00 |
| 800.00 |
| 2450.00 |
| 2850.00 |
| 1600.00 |
| 2975.00 |
| 3000.00 |
+---------+
# （2）选取除上表以外的最大值
select sal
from emp
where sal not in
(select distinct a.sal from emp a join emp b on a.sal<b.sal);
+---------+
| sal |
+---------+
| 5000.00 |
+---------+5 查询平均薪水最高的部门的部门编号
# （1）每个部门的平均薪水
select e.deptno,avg(sal) avgsal
from emp e
group by e.deptno
order by e.deptno;
+--------+-------------+
| deptno | avgsal |
+--------+-------------+
| 10 | 2916.666667 |
| 20 | 2175.000000 |
| 30 | 1566.666667 |
+--------+-------------+
# （2）临时表t中查询最高平均薪水
#（select中加入t.deptno，则会出错,因为会出现所有deptno，而最高只有一个平均薪水）
select max(t.avgsal) maxavgsal
from (select e.deptno,avg(sal) avgsal from emp e group by e.deptno) t;
+-------------+
| maxavgsal |
+-------------+
| 2916.666667 |
+-------------+
# （3）使用having语句过滤
select e.deptno,avg(e.sal) as avgsal
from emp e
group by e.deptno
having avgsal=(select max(t.avgsal) maxavgsal
from (select e.deptno,avg(sal) avgsal from emp e group by e.deptno) t);
+--------+-------------+
| deptno | avgsal |
+--------+-------------+
| 10 | 2916.666667 |
+--------+-------------+6 查询平均薪水最高的部门的部门名称
# 将上一题作为临时表f，连接dept表
select d.deptno,d.dname,f.avgsal
from (select e.deptno,avg(e.sal) as avgsal
from emp e
group by e.deptno
having avgsal=(select max(t.avgsal) maxavgsal
from (select e.deptno,avg(sal) avgsal from emp e group by e.deptno) t)) f
join dept d
on d.deptno=f.deptno;
+--------+------------+-------------+
| deptno | dname | avgsal |
+--------+------------+-------------+
| 10 | ACCOUNTING | 2916.666667 |
+--------+------------+-------------+
# 在having语句添加子查询，先将emp表与dept表先连接，再确定最高薪水
select e.deptno,d.dname,avg(e.sal) avgsal
from emp e
join dept d
on e.deptno=d.deptno
group by e.deptno,d.dname
having avgsal=(select max(t.avgsal) maxavgsal
from (select e.deptno,avg(sal) avgsal from emp e group by e.deptno) t);
+--------+------------+-------------+
| deptno | dname | avgsal |
+--------+------------+-------------+
| 10 | ACCOUNTING | 2916.666667 |
+--------+------------+-------------+7 查询平均薪水的等级最低的部门的部门名称
# （1）每部门平均薪水的等级
select t.deptno,t.dname,s.grade
from (select e.deptno,d.dname,avg(sal) avgsal
from emp e join dept d on e.deptno=d.deptno
group by deptno) t
join salgrade s
on t.avgsal between s.losal and s.hisal;
+--------+------------+-------+
| deptno | dname | grade |
+--------+------------+-------+
| 20 | RESEARCH | 4 |
| 30 | SALES | 3 |
| 10 | ACCOUNTING | 4 |
+--------+------------+-------+
# （2）平均薪水等级最低的部门
select min(f.grade) minGrade
from (select t.deptno,t.dname,s.grade
from (select e.deptno,d.dname,avg(sal) avgsal
from emp e join dept d on e.deptno=d.deptno
group by deptno) t
join salgrade s
on t.avgsal between s.losal and s.hisal) f;
+----------+
| minGrade |
+----------+
| 3 |
+----------+
# （3）最低等级的部门名称（用where或having筛选）
select
t.deptno,t.dname,s.grade
from
(select e.deptno,d.dname,avg(sal) avgsal
from emp e
join dept d
on e.deptno=d.deptno
group by deptno) t
join
salgrade s
on
t.avgsal between s.losal and s.hisal
having
s.grade = (select min(f.grade) minGrade
from (select t.deptno,t.dname,s.grade
from (select e.deptno,d.dname,avg(sal) avgsal
from emp e join dept d on e.deptno=d.deptno group by deptno) t
join salgrade s on t.avgsal between s.losal and s.hisal) f);
+--------+-------+-------+
| deptno | dname | grade |
+--------+-------+-------+
| 30 | SALES | 3 |
+--------+-------+-------+8 查询比普通员工的最高薪水还要高的经理人姓名
# 普通员工没有出现在mgr上
# （1）查找mgr
select distinct mgr from emp;
+------+
| mgr |
+------+
| 7902 |
| 7698 |
| 7839 |
| 7566 |
| NULL |
| 7788 |
| 7782 |
+------+
select * from emp where empno in (select distinct mgr from emp);
+-------+-------+-----------+------+------------+---------+------+--------+
| EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO |
+-------+-------+-----------+------+------------+---------+------+--------+
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 |
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 |
| 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 |
| 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 | 3000.00 | NULL | 20 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 |
+-------+-------+-----------+------+------------+---------+------+--------+
# （2）筛选普通员工
select * from emp where empno not in (select distinct mgr from emp);
Empty set (0.00 sec) #not in 不会自动忽略空值，in会自动忽略空值
select * from emp where empno not in (select distinct mgr from emp where mgr is not null);
+-------+--------+----------+------+------------+---------+---------+--------+
| EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO |
+-------+--------+----------+------+------------+---------+---------+--------+
| 7369 | SMITH | CLERK | 7902 | 1980-12-17 | 800.00 | NULL | 20 |
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 |
| 7876 | ADAMS | CLERK | 7788 | 1987-05-23 | 1100.00 | NULL | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 |
| 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 |
+-------+--------+----------+------+------------+---------+---------+--------+
# （3）查找最高薪水
select max(sal) as maxsal from emp where empno not in (select distinct mgr from emp where mgr is not null);
+---------+
| maxsal |
+---------+
| 1600.00 |
+---------+
# （4）比普通员工最高薪水的经理人名字
select ename,sal from emp
where sal>(select max(sal) as maxsal from emp
where empno not in (select distinct mgr from emp where mgr is not null));
+-------+---------+
| ename | sal |
+-------+---------+
| JONES | 2975.00 |
| BLAKE | 2850.00 |
| CLARK | 2450.00 |
| SCOTT | 3000.00 |
| KING | 5000.00 |
| FORD | 3000.00 |
+-------+---------+9 查询薪水最高的前五名员工
select ename,sal from emp
order by sal desc
limit 5;
+-------+---------+
| ename | sal |
+-------+---------+
| KING | 5000.00 |
| SCOTT | 3000.00 |
| FORD | 3000.00 |
| JONES | 2975.00 |
| BLAKE | 2850.00 |
+-------+---------+10 查询薪水最高的第6-10名员工
select ename,sal from emp
order by sal desc
limit 5,5;
+--------+---------+
| ename | sal |
+--------+---------+
| CLARK | 2450.00 |
| ALLEN | 1600.00 |
| TURNER | 1500.00 |
| MILLER | 1300.00 |
| WARD | 1250.00 |
+--------+---------+11 查询最后入职的5名员工
select ename,hiredate from emp
order by hiredate
limit 5;
+-------+------------+
| ename | hiredate |
+-------+------------+
| SMITH | 1980-12-17 |
| ALLEN | 1981-02-20 |
| WARD | 1981-02-22 |
| JONES | 1981-04-02 |
| BLAKE | 1981-05-01 |
+-------+------------+12 查询每个薪水等级有多少员工
# （1）每个员工的薪水等级
select e.ename,s.grade,e.sal from emp e
join salgrade s
on e.sal between s.losal and s.hisal;
+--------+-------+---------+
| ename | grade | sal |
+--------+-------+---------+
| SMITH | 1 | 800.00 |
| ALLEN | 3 | 1600.00 |
| WARD | 2 | 1250.00 |
| JONES | 4 | 2975.00 |
| MARTIN | 2 | 1250.00 |
| BLAKE | 4 | 2850.00 |
| CLARK | 4 | 2450.00 |
| SCOTT | 4 | 3000.00 |
| KING | 5 | 5000.00 |
| TURNER | 3 | 1500.00 |
| ADAMS | 1 | 1100.00 |
| JAMES | 1 | 950.00 |
| FORD | 4 | 3000.00 |
| MILLER | 2 | 1300.00 |
+--------+-------+---------+
# （2）临时表t，分组函数group by
select t.grade,count(t.grade) courtgrade
from (select e.ename,s.grade,e.sal from emp e
join salgrade s on e.sal between s.losal and s.hisal) t
group by t.grade;
+-------+------------+
| grade | courtgrade |
+-------+------------+
| 1 | 3 |
| 3 | 2 |
| 2 | 3 |
| 4 | 5 |
| 5 | 1 |
+-------+------------+13 列出所有员工及领导名字
# 一张表当作两张表,所有员工需要left join
select e.ename,b.ename as leadername
from emp e
left join emp b
on e.mgr=b.empno;
+--------+------------+
| ename | leadername |
+--------+------------+
| SMITH | FORD |
| ALLEN | BLAKE |
| WARD | BLAKE |
| JONES | KING |
| MARTIN | BLAKE |
| BLAKE | KING |
| CLARK | KING |
| SCOTT | JONES |
| KING | NULL |
| TURNER | BLAKE |
| ADAMS | SCOTT |
| JAMES | BLAKE |
| FORD | JONES |
| MILLER | CLARK |
+--------+------------+14 受雇日期早于其直接上级的所有员工编号、姓名、部门名称
# （1）所有员工、领导的编号、姓名
select e.empno,e.deptno,e.ename,e.hiredate,b.ename as leadername,b.hiredate as leaderhiredate
from emp e
left join emp b
on e.mgr=b.empno;
+-------+--------+--------+------------+------------+----------------+
| empno | deptno | ename | hiredate | leadername | leaderhiredate |
+-------+--------+--------+------------+------------+----------------+
| 7369 | 20 | SMITH | 1980-12-17 | FORD | 1981-12-03 |
| 7499 | 30 | ALLEN | 1981-02-20 | BLAKE | 1981-05-01 |
| 7521 | 30 | WARD | 1981-02-22 | BLAKE | 1981-05-01 |
| 7566 | 20 | JONES | 1981-04-02 | KING | 1981-11-17 |
| 7654 | 30 | MARTIN | 1981-09-28 | BLAKE | 1981-05-01 |
| 7698 | 30 | BLAKE | 1981-05-01 | KING | 1981-11-17 |
| 7782 | 10 | CLARK | 1981-06-09 | KING | 1981-11-17 |
| 7788 | 20 | SCOTT | 1987-04-19 | JONES | 1981-04-02 |
| 7839 | 10 | KING | 1981-11-17 | NULL | NULL |
| 7844 | 30 | TURNER | 1981-09-08 | BLAKE | 1981-05-01 |
| 7876 | 20 | ADAMS | 1987-05-23 | SCOTT | 1987-04-19 |
| 7900 | 30 | JAMES | 1981-12-03 | BLAKE | 1981-05-01 |
| 7902 | 20 | FORD | 1981-12-03 | JONES | 1981-04-02 |
| 7934 | 10 | MILLER | 1982-01-23 | CLARK | 1981-06-09 |
+-------+--------+--------+------------+------------+----------------+
# （2）早于上级的所有员工的编号、姓名
select t.deptno,t.ename
from (select e.deptno,e.ename,e.hiredate,b.ename as leadername,b.hiredate as leaderhiredate
from emp e left join emp b on e.mgr=b.empno) t
where t.hiredate<t.leaderhiredate;
+--------+-------+
| deptno | ename |
+--------+-------+
| 20 | SMITH |
| 30 | ALLEN |
| 30 | WARD |
| 20 | JONES |
| 30 | BLAKE |
| 10 | CLARK |
+--------+-------+
# （3）早于上级的所有员工的编号、姓名、部门名称
select f.empno,f.ename,d.dname
from (select t.empno,t.deptno,t.ename
from (select e.empno,e.deptno,e.ename,e.hiredate,b.ename leadername,b.hiredate
leaderhiredate
from emp e left join emp b on e.mgr=b.empno) t
where t.hiredate<t.leaderhiredate) f
join dept d
on d.deptno=f.deptno;
+-------+-------+------------+
| empno | ename | dname |
+-------+-------+------------+
| 7369 | SMITH | RESEARCH |
| 7499 | ALLEN | SALES |
| 7521 | WARD | SALES |
| 7566 | JONES | RESEARCH |
| 7698 | BLAKE | SALES |
| 7782 | CLARK | ACCOUNTING |
+-------+-------+------------+# 化简版
select d.dname,e.empno,e.ename
from emp e
join emp b
on e.mgr=b.empno
join dept d
on e.deptno=d.deptno
where e.hiredate>b.hiredate;
+------------+-------+--------+
| dname | empno | ename |
+------------+-------+--------+
| SALES | 7654 | MARTIN |
| RESEARCH | 7788 | SCOTT |
| SALES | 7844 | TURNER |
| RESEARCH | 7876 | ADAMS |
| SALES | 7900 | JAMES |
| RESEARCH | 7902 | FORD |
| ACCOUNTING | 7934 | MILLER |
+------------+-------+--------+15 列出部门名称和员工信息，同时列出没有员工的部门
select d.dname,e.*
from emp e
right join dept d
on e.deptno=d.deptno;
+------------+-------+--------+-----------+------+------------+---------+---------+--------+
| dname | EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO |
+------------+-------+--------+-----------+------+------------+---------+---------+--------+
| ACCOUNTING | 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 |
| ACCOUNTING | 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 |
| ACCOUNTING | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 |
| RESEARCH | 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 |
| RESEARCH | 7876 | ADAMS | CLERK | 7788 | 1987-05-23 | 1100.00 | NULL | 20 |
| RESEARCH | 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 | 3000.00 | NULL | 20 |
| RESEARCH | 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 |
| RESEARCH | 7369 | SMITH | CLERK | 7902 | 1980-12-17 | 800.00 | NULL | 20 |
| SALES | 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 |
| SALES | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 |
| SALES | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 |
| SALES | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 |
| SALES | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 |
| SALES | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 |
| OPERATIONS | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
+------------+-------+--------+-----------+------+------------+---------+---------+--------+16 列出至少5个员工的所有部门
# （1）每个部门的员工数量
select e.deptno,count(e.ename) as totalEmp
from emp e
group by e.deptno;
+--------+----------+
| deptno | totalEmp |
+--------+----------+
| 20 | 5 |
| 30 | 6 |
| 10 | 3 |
+--------+----------+
# （2）有5个员工的部门
select t.deptno,t.totalEmp
from (select e.deptno,count(e.ename) as totalEmp
from emp e group by e.deptno) t
where t.totalEmp>=5;
+--------+----------+
| deptno | totalEmp |
+--------+----------+
| 20 | 5 |
| 30 | 6 |
+--------+----------+
select e.deptno,count(e.ename) as totalEmp
from emp e
group by e.deptno
having totalEmp>=5;
+--------+----------+
| deptno | totalEmp |
+--------+----------+
| 20 | 5 |
| 30 | 6 |
+--------+----------+17 列出薪水比“SMITH”多的所有员工信息
# （1）查询"SMITH"薪水
select sal from emp where ename="SMITH";
+--------+
| sal |
+--------+
| 800.00 |
+--------+
# （2）比较
select * from emp where sal>(select sal from emp where ename="SMITH");
+-------+--------+-----------+------+------------+---------+---------+--------+
| EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO |
+-------+--------+-----------+------+------------+---------+---------+--------+
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 |
| 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 |
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 | 3000.00 | NULL | 20 |
| 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 |
| 7876 | ADAMS | CLERK | 7788 | 1987-05-23 | 1100.00 | NULL | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 |
| 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 |
+-------+--------+-----------+------+------------+---------+---------+--------+——数据：bjpowernode.sql
DROP TABLE IF EXISTS EMP;
DROP TABLE IF EXISTS DEPT;
DROP TABLE IF EXISTS SALGRADE;
CREATE TABLE DEPT
(DEPTNO int(2) not null ,
DNAME VARCHAR(14) ,
LOC VARCHAR(13),
primary key (DEPTNO)
);
CREATE TABLE EMP
(EMPNO int(4) not null ,
ENAME VARCHAR(10),
JOB VARCHAR(9),
MGR INT(4),
HIREDATE DATE DEFAULT NULL,
SAL DOUBLE(7,2),
COMM DOUBLE(7,2),
primary key (EMPNO),
DEPTNO INT(2)
)
;
CREATE TABLE SALGRADE
( GRADE INT,
LOSAL INT,
HISAL INT );
INSERT INTO DEPT ( DEPTNO, DNAME, LOC ) VALUES ( 10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO DEPT ( DEPTNO, DNAME, LOC ) VALUES ( 20, 'RESEARCH', 'DALLAS');
INSERT INTO DEPT ( DEPTNO, DNAME, LOC ) VALUES ( 30, 'SALES', 'CHICAGO');
INSERT INTO DEPT ( DEPTNO, DNAME, LOC ) VALUES ( 40, 'OPERATIONS', 'BOSTON');
commit;
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7369, 'SMITH', 'CLERK', 7902, '1980-12-17', 800, NULL, 20);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7499, 'ALLEN', 'SALESMAN', 7698, '1981-02-20', 1600, 300, 30);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7521, 'WARD', 'SALESMAN', 7698, '1981-02-22', 1250, 500, 30);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7566, 'JONES', 'MANAGER', 7839, '1981-04-02', 2975, NULL, 20);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7654,'MARTIN', 'SALESMAN', 7698, '1981-09-28', 1250, 1400, 30);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7698, 'BLAKE', 'MANAGER', 7839, '1981-05-01', 2850, NULL, 30);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7782, 'CLARK', 'MANAGER', 7839, '1981-06-09', 2450, NULL, 10);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7788, 'SCOTT', 'ANALYST', 7566, '1987-04-19', 3000, NULL, 20);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7839, 'KING', 'PRESIDENT', NULL, '1981-11-17', 5000, NULL, 10);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7844, 'TURNER', 'SALESMAN', 7698, '1981-09-08', 1500, 0, 30);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7876, 'ADAMS', 'CLERK', 7788, '1987-05-23', 1100, NULL, 20);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7900, 'JAMES', 'CLERK', 7698, '1981-12-03', 950, NULL, 30);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7902, 'FORD', 'ANALYST', 7566, '1981-12-03', 3000, NULL, 20);
INSERT INTO EMP ( EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM,DEPTNO ) VALUES ( 7934, 'MILLER', 'CLERK', 7782, '1982-01-23', 1300, NULL, 10);
commit;
INSERT INTO SALGRADE ( GRADE, LOSAL, HISAL ) VALUES ( 1, 700, 1200);
INSERT INTO SALGRADE ( GRADE, LOSAL, HISAL ) VALUES ( 2, 1201, 1400);
INSERT INTO SALGRADE ( GRADE, LOSAL, HISAL ) VALUES ( 3, 1401, 2000);
INSERT INTO SALGRADE ( GRADE, LOSAL, HISAL ) VALUES ( 4, 2001, 3000);
INSERT INTO SALGRADE ( GRADE, LOSAL, HISAL ) VALUES ( 5, 3001, 9999);
commit;
dept
+--------+------------+----------+
| DEPTNO | DNAME | LOC |
+--------+------------+----------+
| 10 | ACCOUNTING | NEW YORK |
| 20 | RESEARCH | DALLAS |
| 30 | SALES | CHICAGO |
| 40 | OPERATIONS | BOSTON |
+--------+------------+----------+
emp
+-------+--------+-----------+------+------------+---------+---------+--------+
| EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO |
+-------+--------+-----------+------+------------+---------+---------+--------+
| 7369 | SMITH | CLERK | 7902 | 1980-12-17 | 800.00 | NULL | 20 |
| 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 |
| 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 |
| 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 |
| 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 |
| 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 |
| 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 |
| 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 | 3000.00 | NULL | 20 |
| 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 |
| 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 |
| 7876 | ADAMS | CLERK | 7788 | 1987-05-23 | 1100.00 | NULL | 20 |
| 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 |
| 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 |
| 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 |
+-------+--------+-----------+------+------------+---------+---------+--------+
salgrade
+-------+-------+-------+
| GRADE | LOSAL | HISAL |
+-------+-------+-------+
| 1 | 700 | 1200 |
| 2 | 1201 | 1400 |
| 3 | 1401 | 2000 |
| 4 | 2001 | 3000 |
| 5 | 3001 | 9999 |
+-------+-------+-------+
