From e235e6ece87e211c51bcca2a75ff091b5c714bbf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=91=A8=E4=BA=9A=E8=BE=89?= <3192667214@qq.com> Date: Thu, 19 Oct 2023 17:46:56 +0000 Subject: [PATCH] =?UTF-8?q?41=20=E5=91=A8=E4=BA=9A=E8=BE=89?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 周亚辉 <3192667214@qq.com> --- .../20231019 \344\272\213\345\212\241.md" | 98 +++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 "41 \345\221\250\344\272\232\350\276\211/20231019 \344\272\213\345\212\241.md" diff --git "a/41 \345\221\250\344\272\232\350\276\211/20231019 \344\272\213\345\212\241.md" "b/41 \345\221\250\344\272\232\350\276\211/20231019 \344\272\213\345\212\241.md" new file mode 100644 index 0000000..dfc691a --- /dev/null +++ "b/41 \345\221\250\344\272\232\350\276\211/20231019 \344\272\213\345\212\241.md" @@ -0,0 +1,98 @@ +# 笔记 + + + +# 作业 + +```mysql +-- 部门表 +create table dept( + deptno int primary key auto_increment, -- 部门编号 + dname varchar(14) , -- 部门名字 + loc varchar(13) -- 地址 +) ; +-- 员工表 +create table emp( + empno int primary key auto_increment,-- 员工编号 + ename varchar(10), -- 员工姓名 - + job varchar(9), -- 岗位 + mgr int, -- 直接领导编号 + hiredate date, -- 雇佣日期，入职日期 + sal int, -- 薪水 + comm int, -- 提成 + deptno int not null, -- 部门编号 + foreign key (deptno) references dept(deptno) +); +insert into dept values(10,'财务部','北京'); +insert into dept values(20,'研发部','上海'); +insert into dept values(30,'销售部','广州'); +insert into dept values(40,'行政部','深圳'); +insert into emp values(7369,'刘一','职员',7902,'1980-12-17',800,null,20); +insert into emp values(7499,'陈二','推销员',7698,'1981-02-20',1600,300,30); +insert into emp values(7521,'张三','推销员',7698,'1981-02-22',1250,500,30); +insert into emp values(7566,'李四','经理',7839,'1981-04-02',2975,null,20); +insert into emp values(7654,'王五','推销员',7698,'1981-09-28',1250,1400,30); +insert into emp values(7698,'赵六','经理',7839,'1981-05-01',2850,null,30); +insert into emp values(7782,'孙七','经理',7839,'1981-06-09',2450,null,10); +insert into emp values(7788,'周八','分析师',7566,'1987-06-13',3000,null,20); +insert into emp values(7839,'吴九','总裁',null,'1981-11-17',5000,null,10); +insert into emp values(7844,'郑十','推销员',7698,'1981-09-08',1500,0,30); +insert into emp values(7876,'郭十一','职员',7788,'1987-06-13',1100,null,20); +insert into emp values(7900,'钱多多','职员',7698,'1981-12-03',950,null,30); +insert into emp values(7902,'大锦鲤','分析师',7566,'1981-12-03',3000,null,20); +insert into emp values(7934,'木有钱','职员',7782,'1983-01-23',1300,null,10); + + + +SELECT * from emp; +-- +-- 1、列出最低薪金大于1500的各种工作。 +-- +SELECT * from (SELECT DISTINCT job,min(sal) over (PARTITION by job) misa from emp) a WHERE misa>1500; + +-- 2、列出在部门 "销售部" 工作的员工的姓名，假定不知道销售部的部门编号。 +-- +SELECT * from emp,dept WHERE emp.deptno=dept.deptno and dname='销售部'; + + +-- 3、列出薪金高于公司平均薪金的所有员工。 +-- +SELECT * from emp where sal>(SELECT avg(sal) from emp); + +-- 4、列出与"周八"从事相同工作的所有员工。 +-- +SELECT * from emp WHERE job=(SELECT job from emp WHERE ename='周八')and ename!='周八'; + +-- 5、列出薪金等于部门30中员工的薪金的所有员工的姓名和薪金。 +-- +SELECT * from emp where sal in(SELECT sal from emp where deptno=30)and deptno!=30; + +-- 6、列出薪金高于在部门30工作的所有员工的薪金的员工姓名和薪金。 +-- +SELECT * from emp where sal > (SELECT max(sal) from emp where deptno=30)and deptno!=30; + +-- 7、列出在每个部门工作的员工数量、平均工资、平均服务年限。 +-- +SELECT DISTINCT dname,COUNT(*) over (PARTITION by emp.deptno),AVG(sal) over (PARTITION by emp.deptno ),avg(year(NOW())-year(hiredate)) over(PARTITION by emp.deptno) from emp,dept WHERE emp.deptno=dept.deptno; + +-- 8、列出所有员工的姓名、部门名称和工资。 +-- +SELECT ename,dname,sal+IFNULL(comm,0) from emp,dept WHERE emp.deptno=dept.deptno; + +-- 9、列出所有部门的详细信息和部门人数。 +-- +SELECT DISTINCT dept.*,count(*) over(PARTITION by dname) from emp,dept WHERE emp.deptno=dept.deptno; + +-- 10、列出各种工作的最低工资。 +-- +SELECT DISTINCT job,min(sal+IFNULL(comm,0)) over (PARTITION by job) from emp; + +-- 11、列出各个部门的 经理 的最低薪金。 +-- +SELECT ename,dname,job,min(sal) over (PARTITION by emp.deptno) from emp,dept WHERE emp.deptno=dept.deptno and job='经理'; + +-- 12、列出所有员工的年工资,按年薪从低到高排序。 +SELECT *,(sal+IFNULL(comm,0))*12 yesa from emp,dept WHERE emp.deptno=dept.deptno ORDER BY yesa; + +``` + -- Gitee