224 lines
6.1 KiB
PL/PgSQL
224 lines
6.1 KiB
PL/PgSQL
USE db3;
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CREATE TABLE IF NOT EXISTS music(
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title VARCHAR(32) COMMENT '专辑名',
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alias VARCHAR(32) COMMENT '专辑别名',
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image VARCHAR(64),
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style VARCHAR(8),
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`type` VARCHAR(4),
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`medium` VARCHAR(4),
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publish_time DATE,
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publisher VARCHAR(16),
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number TINYINT,
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barcode BIGINT,
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summary VARCHAR(1024),
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artist VARCHAR(16),
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id INT PRIMARY KEY AUTO_INCREMENT
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);
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CREATE TABLE IF NOT EXISTS song(
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`name` VARCHAR(32),
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`serial_number` TINYINT,
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id INT PRIMARY KEY AUTO_INCREMENT,
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music_id INT
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);
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CREATE TABLE IF NOT EXISTS review(
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content VARCHAR(256),
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rating TINYINT,
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review_time DATETIME,
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music_id INT,
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user_id INT
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);
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CREATE TABLE IF NOT EXISTS `user`(
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username VARCHAR(16) UNIQUE,
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image VARCHAR(64),
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signature VARCHAR(64),
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nickname VARCHAR(16),
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id INT PRIMARY KEY
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);
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CREATE TABLE IF NOT EXISTS user_music(
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id INT PRIMARY KEY AUTO_INCREMENT,
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user_id INT,
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music_id INT
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);
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ALTER TABLE song ADD CONSTRAINT fn_music_song FOREIGN KEY(music_id) REFERENCES music(id);
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ALTER TABLE review ADD CONSTRAINT fn_music_review FOREIGN KEY(music_id) REFERENCES music(id);
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ALTER TABLE review ADD CONSTRAINT fn_user_review FOREIGN KEY(user_id) REFERENCES `user`(id);
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ALTER TABLE user_music ADD CONSTRAINT fn_key1 FOREIGN KEY(user_id) REFERENCES `user`(id);
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ALTER TABLE user_music ADD CONSTRAINT fn_key2 FOREIGN KEY (music_id) REFERENCES music(id);
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DROP TABLE IF EXISTS emp;
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DROP TABLE IF EXISTS dept;
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DROP TABLE IF EXISTS job;
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DROP TABLE IF EXISTS salarygrade;
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-- 部门表
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CREATE TABLE dept (
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did INT PRIMARY KEY PRIMARY KEY, -- 部门id
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dname VARCHAR(50), -- 部门名称
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loc VARCHAR(50) -- 部门所在地
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);
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-- 职务表，职务名称，职务描述
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CREATE TABLE job (
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id INT PRIMARY KEY,
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jname VARCHAR(20),
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description VARCHAR(50)
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);
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-- 员工表
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CREATE TABLE emp (
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id INT PRIMARY KEY, -- 员工id
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ename VARCHAR(50), -- 员工姓名
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job_id INT, -- 职务id
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mgr INT , -- 上级领导
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joindate DATE, -- 入职日期
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salary DECIMAL(7,2), -- 工资
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bonus DECIMAL(7,2), -- 奖金
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dept_id INT -- 所在部门编号
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);
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ALTER TABLE emp ADD CONSTRAINT emp_jobid_ref_job_id_fk FOREIGN KEY (job_id) REFERENCES job (id);
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ALTER TABLE emp ADD CONSTRAINT emp_deptid_ref_dept_id_fk FOREIGN KEY (dept_id) REFERENCES dept (did);
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-- 工资等级表
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CREATE TABLE salarygrade (
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grade INT PRIMARY KEY, -- 级别
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losalary INT, -- 最低工资
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hisalary INT -- 最高工资
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);
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-- 添加4个部门
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INSERT INTO dept(did,dname,loc) VALUES
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(10,'教研部','北京'),
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(20,'学工部','上海'),
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(30,'销售部','广州'),
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(40,'财务部','深圳');
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-- 添加4个职务
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INSERT INTO job (id, jname, description) VALUES
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(1, '董事长', '管理整个公司，接单'),
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(2, '经理', '管理部门员工'),
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(3, '销售员', '向客人推销产品'),
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(4, '文员', '使用办公软件');
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-- 添加员工
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INSERT INTO emp(id,ename,job_id,mgr,joindate,salary,bonus,dept_id) VALUES
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(1001,'孙悟空',4,1004,'2000-12-17','8000.00',NULL,20),
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(1002,'卢俊义',3,1006,'2001-02-20','16000.00','3000.00',30),
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(1003,'林冲',3,1006,'2001-02-22','12500.00','5000.00',30),
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(1004,'唐僧',2,1009,'2001-04-02','29750.00',NULL,20),
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(1005,'李逵',4,1006,'2001-09-28','12500.00','14000.00',30),
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(1006,'宋江',2,1009,'2001-05-01','28500.00',NULL,30),
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(1007,'刘备',2,1009,'2001-09-01','24500.00',NULL,10),
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(1008,'猪八戒',4,1004,'2007-04-19','30000.00',NULL,20),
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(1009,'罗贯中',1,NULL,'2001-11-17','50000.00',NULL,10),
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(1010,'吴用',3,1006,'2001-09-08','15000.00','0.00',30),
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(1011,'沙僧',4,1004,'2007-05-23','11000.00',NULL,20),
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(1012,'李逵',4,1006,'2001-12-03','9500.00',NULL,30),
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(1013,'小白龙',4,1004,'2001-12-03','30000.00',NULL,20),
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(1014,'关羽',4,1007,'2002-01-23','13000.00',NULL,10);
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-- 添加5个工资等级
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INSERT INTO salarygrade(grade,losalary,hisalary) VALUES
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(1,7000,12000),
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(2,12010,14000),
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(3,14010,20000),
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(4,20010,30000),
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(5,30010,99990);
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# 查询所有员工信息。查询员工编号，员工姓名，工资，职务名称，职务描述
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SELECT emp.id,ename,salary,jname,description FROM emp LEFT JOIN job ON emp.`job_id`=job.`id` ;
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# 查询员工编号，员工姓名，工资，职务名称，职务描述，部门名称，部门位置
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SELECT t1.id,ename,salary,jname,description,dname,loc
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FROM (SELECT emp.id id,ename,salary,jname,description,dept_id
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FROM emp LEFT JOIN job ON emp.`job_id`=job.`id`)t1
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LEFT JOIN dept ON t1. dept_id =dept.`did`;
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# 查询员工姓名，工资，工资等级
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SELECT t2.ename,t2.salary,t1.grade
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FROM salarygrade t1 ,emp t2
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WHERE t2.salary<t1.hisalary AND t2.salary>t1.losalary;
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#查询员工姓名，工资，职务名称，职务描述，部门名称，部门位置，工资等级
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SELECT ename,salary,jname,description,dname,loc,grade
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FROM(SELECT t1.id,ename,salary,jname,description,dname,loc
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FROM (SELECT emp.id id,ename,salary,jname,description,dept_id
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FROM emp LEFT JOIN job ON emp.`job_id`=job.`id`)t1
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LEFT JOIN dept ON t1. dept_id =dept.`did`) t2,
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salarygrade WHERE t2.salary<=salarygrade.hisalary AND t2.salary>=salarygrade.losalary;
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# 查询出部门编号、部门名称、部门位置、部门人数
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SELECT dept.*,t1.num '部门人数'
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FROM dept LEFT JOIN
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(SELECT dept_id,COUNT(*) num FROM emp GROUP BY dept_id) t1
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ON dept.`did`=t1.dept_id;
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# 事务操作
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DROP TABLE IF EXISTS account;
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-- 创建账户表
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CREATE TABLE account(
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id INT PRIMARY KEY AUTO_INCREMENT,
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NAME VARCHAR(10),
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money DOUBLE(10,2)
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);
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-- 添加数据
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INSERT INTO account(NAME,money) VALUES('张三',1000),('李四',1000);
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-- 转账操作
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-- 1.查询李四的余额
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SELECT * FROM account;
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-- 2.李四金额 -500
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UPDATE account SET money =money -500 WHERE NAME='李四';
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出错了...
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-- 3.张三金额 +500
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UPDATE account SET money =money +500 WHERE NAME ='张三';
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-- 带事务的转账操作
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-- 1.查询李四的余额
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SELECT * FROM account;
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-- 开启事务
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BEGIN;
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-- 2.李四金额 -500
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UPDATE account SET money =money -500 WHERE NAME='李四';
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出错了...
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-- 3.张三金额 +500
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UPDATE account SET money =money +500 WHERE NAME ='张三';
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-- 提交数据
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COMMIT;
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-- 回滚事务
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ROLLBACK;
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SELECT @@autocommit;
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# 查询到的结果是1 则表示自动提交，结果是0表示手动提交。
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# 当然也可以通过下面语句修改提交方式
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SET @@autocommit = 0;
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