程式碼直接依序複製就可以
-- 建库 CREATE DATABASE `emp`; -- 打开库 USE emp; -- 建dept表 CREATE TABLE `dept`( `deptno` INT(2) NOT NULL, `dname` VARCHAR(14), `loc` VARCHAR(13), CONSTRAINT pk_dept PRIMARY KEY(deptno) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 键emp表 CREATE TABLE `emp` ( `empno` int(4) NOT NULL PRIMARY KEY, `ename` VARCHAR(10), `job` VARCHAR(9), `mgr` int(4), `hiredate` DATE, `sal` float(7,2), `comm` float(7,2), `deptno` int(2), CONSTRAINT fk_deptno FOREIGN KEY(deptno) REFERENCES dept(deptno) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 建salgrade表 CREATE TABLE `salgrade` ( `grade` int, `losal` int, `hisal` int ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 插入数据 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'); 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,'1987-07-13',3000,NULL,20); INSERT INTO EMP VALUES (7839,'KING','PRESIDENT',NULL,'1981-11-07',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,'1987-07-13',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); INSERT INTO SALGRADE VALUES (1,700,1200); INSERT INTO SALGRADE VALUES (2,1201,1400); INSERT INTO SALGRADE VALUES (3,1401,2000); INSERT INTO SALGRADE VALUES (4,2001,3000); INSERT INTO SALGRADE VALUES (5,3001,9999);
#dept表：
##emp表：
salgrade表：
有點亂，直接黏過來的格式不一樣大家將就一下，勉強還是能看清的– 2. 列出公司各個薪資等級員工的數量、平均薪資。
show tables; select * from salgrade; select s.grade,count(),avg(e.sal) from emp e left join salgrade s on e.sal between s.losal and s.hisal group by s.grade ;
select ename,sal,d.dname,d.deptno from emp e left join dept d on e.deptno = d.deptno where e.sal > (select max(sal) from emp where deptno = 30);
select count(),avg(sal),avg(year(now())-year(hiredate)) from emp group by deptno;
SALES research accounting select e.ename,d.dname,e.sal from emp e left join dept d on d.deptno = e.deptno;
OPERATIONS select d.,count(e.ename) from dept d left join emp e on e.deptno = d.deptno group by d.deptno;
select a.ename,t. from emp a left join (select e.job,min(e.sal) from emp e group by e.job) t on a.job = t.job;
– binary 实现区分大小写 – select ename from emp where job = binary ‘MANAGER'; – select binary ‘a' = ‘a'; – select binary ‘a'; – select binary ‘A'; select * from emp where job = binary ‘MANAGER'; select a.mm,c.ename,c.job,b.dname,b.cc from (select d.deptno,min(sal) mm from emp e left join dept d on e.deptno = d.deptno where job = ‘MANAGER' group by deptno) a left join (select d.deptno,d.dname,count() cc from emp e left join dept d on e.deptno = d.deptno group by d.deptno) b on a.deptno = b.deptno left join emp c on c.sal = a.mm and b.deptno = c.deptno ;
– 9. 列出所有员工的年工资，所在部门名称，按年薪从低到高排序。
select empno,ename,sal12,d.dname from emp left join dept d on d.deptno = emp.deptno order by sal12 asc;
– 10. 查出某个员工的上级主管及所在部门名称，并要求出这些主管中的薪水超过3000
select a.empno,a.ename,b.ename,b.sal from emp a left join emp b on a.mgr = b.empno where b.sal>3000 and a.empno = 7566; select a.empno,a.ename,b.ename,b.sal from emp a left join emp b on a.mgr = b.empno where b.sal>3000; select a.empno,a.ename,b.ename,b.sal from emp a left join emp b on a.mgr = b.empno;
– 11. 求出部门名称中，带‘S’字符的部门员工的、工资合计、部门人数。
select d.dname,count(),sum(e.sal) from emp e left join dept d on e.deptno = d.deptno where d.dname like ‘%s%' group by d.deptno; select * from emp;
– 12. 给任职日期超过30年或者在87年雇佣的雇员加薪，加薪原则：10部门增长10%，20部门增长 20%，30部门增长30%，依次类推。
select empno,ename,sal,sal+sal*(deptno/100) from emp where year(curdate()) - year(hiredate)>30 or year(hiredate)=2022; update emp set sal = sal+sal*(deptno/100) where year(curdate()) - year(hiredate)>30 or year(hiredate)=2022; select * from emp;
– 13. 列出至少有一个员工的所有部门的信息
select distinct d.* from dept d join emp e on d.deptno = e.deptno;
– 14. 列出薪金比SMITH低的所有员工
select * from emp where sal < (select sal from emp where ename = ‘SMITH')
– 15. 列出所有员工的姓名以及其直接上级的姓名：
select a.empno,a.ename,b.ename from emp a left join emp b on a.mgr = b.empno;
– 16. 列出受雇日期早于其直接上级的所有员工的编号、姓名，部门名称
select a.empno,a.ename,b.ename,d.dname from emp a left join emp b on a.mgr = b.empno and a.hiredate<b.hiredate left join dept d on d.deptno = a.deptno;
– 17. 列出部门名称和这些部门的员工信息，同时列出那些没有员工的部门
select * from dept d left join emp e on d.deptno = e.deptno;
– 18. 列出所有"CLERK(职员)"的姓名以及部门名称，部门的人数
select a.ename,a.job,b.dname,b.cc from emp a join (select d.deptno,d.dname,count() cc from dept d left join emp e on d.deptno = e.deptno group by d.deptno) b on b.deptno = a.deptno and a.job = ‘CLERK';
– 19. 列出最低薪金大于1500的各种工作以及从事此工作的全部雇员人数
select job,max(sal),min(sal),avg(sal),count() from emp where sal>1500 group by job;
– 20. 列出在部门"SALES"工作的员工的姓名，假定不知道销售部的部门编号
select ename from emp where deptno in (select deptno from dept where dname=‘sales'); select e.ename from emp e join dept d on e.deptno = d.deptno and d.dname=‘sales';
– 21. 列出薪金高于公司平均薪金的所有员工，所在部门，上级领导，公司的工资等级
select a.ename,a.en,d.dname,a.sal,s.grade from (select a.deptno,a.ename,b.ename en,a.sal from emp a join emp b on a.mgr = b.empno and a.sal>(select avg(sal) from emp)) a left join dept d on a.deptno=d.deptno left join salgrade s on a.sal between s.losal and s.hisal; select a.ename,b.ename from emp a join emp b on a.mgr = b.empno and a.sal> (select avg(sal) from emp);
– 22. 列出至少有一个员工的所有部门编号、名称，并统计出这些部门的平均工资、最低工资、最高 工资。
select e.deptno,d.dname,avg(e.sal),max(e.sal),min(sal),count() from dept d join emp e on e.deptno = d.deptno group by e.deptno;
– 23. 列出薪金比“SMITH”或“ALLEN”多的所有员工的编号、姓名、部门名称、其领导姓名。
select a.empno,a.ename,d.dname,b.ename from (select * from emp where sal >(select min(sal) from emp where ename in (‘smith',‘allen'))) a left join emp b on a.mgr = b.empno left join dept d on d.deptno = a.deptno;
– 24. 列出所有员工的编号、姓名及其直接上级的编号、姓名，显示的结果按领导年工资的降序排 列。
select a.empno,a.ename,a.sal12,b.empno,b.ename,b.sal12 from emp a left join emp b on a.mgr = b.empno order by b.sal12;
– 25. 列出受雇日期早于其直接上级的所有员工的编号、姓名、部门名称、部门位置、部门人数。
select a.empno,a.ename,b.ename,d.dname from emp a left join emp b on a.mgr = b.empno and a.hiredate<b.hiredate left join dept d on d.deptno = a.deptno;
– 26. 列出部门名称和这些部门的员工信息（数量、平均工资），同时列出那些没有员工的部门。
select d.deptno,d.dname,count(e.ename),avg(sal) from dept d left join emp e on d.deptno = e.deptno group by d.deptno;
– 27. 列出所有“CLERK”（办事员）的姓名及其部门名称，部门的人数，工资等级。
select a.ename,a.job,b.dname,b.cc from emp a join (select d.deptno,d.dname,count() cc from dept d left join emp e on d.deptno = e.deptno group by d.deptno) b on b.deptno = a.deptno and a.job = ‘CLERK'; select e.deptno,count(e.deptno) from (select a.deptno,a.ename,d.dname,s.grade from (select deptno,ename,sal from emp where job=‘CLERK') a left join dept d on a.deptno=d.deptno left join salgrade s on a.sal between s.losal and s.hisal) aa left join emp e on aa.deptno = e.deptno group by e.deptno; select t1.,t2.deptcount from (select d.deptno,e.ename,e.job,d.dname,s.grade from emp e join dept d on e.deptno = d.deptno join salgrade s on e.sal between s.losal and s.hisal where e.job = ‘CLERK') t1 join (select deptno, count() as deptcount from emp group by deptno) t2 on t1.deptno = t2.deptno;
– 28. 列出最低薪金大于1500的各种工作及此从事此工作的全部雇员人数及所在部门名称、位置、 平均工资。
select job,max(sal),min(sal),avg(sal),count() from emp where sal>1500 group by job;
– 29. 列出在部门“SALES”（销售部）工作的员工的姓名、基本工资、雇佣日期、部门名称，假定 不知道销售部的部门编号。
select e.ename,e.sal,e.hiredate,d.dname from emp e join dept d on d.deptno = e.deptno and d.dname=‘sales';
– 30. 列出薪金高于公司平均薪金的所有员工，所在部门，上级领导，公司的工资等级。
select a.ename,a.en,d.dname,a.sal,s.grade from (select a.deptno,a.ename,b.ename en,a.sal from emp a join emp b on a.mgr = b.empno and a.sal>(select avg(sal) from emp)) a left join dept d on a.deptno=d.deptno left join salgrade s on a.sal between s.losal and s.hisal;
– 31. 列出与“SCOTT”从事相同工作的所有员工及部门名称，部门人数。
create view v1 as select b.ename,d.dname,a.cc from (select deptno,count(*) cc from emp group by deptno) a join (select ename,deptno from emp where job = (select job from emp where ename = ‘scott')) b on b.deptno=a.deptno left join dept d on d.deptno = b.deptno; select * from v1;
– 32. 查询dept表的结构
desc emp; describe emp; show create table emp; show columns from emp;
– 33. 检索emp表，用is a 这个字符串来连接员工姓名和工种两个字段 is a 是oracle数据库
select concat(empno,ename,job) from emp; select concat_ws(‘-',empno,ename,job) from emp; select distinct job from emp; select group_concat(distinct job) from emp; select group_concat(distinct ename) from emp; select group_concat(distinct job order by job asc separator ‘=') from emp;
– 34. 检索emp表中有提成的员工姓名、月收入及提成。
select ename,sal,comm from emp where comm is not null; select ename,sal,comm from emp where comm is not null and comm>0;
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