mysql实例代码

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-- 创建数据表stu   CREATE TABLE stu ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, sex VARCHAR(2) NOT NULL, class_id INT, age INT, login_date DATE );    -- 创建数据表class CREATE TABLE class ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, grade VARCHAR(10) NOT NULL, t_name VARCHAR(25) NOT NULL );    -- 向数据表stu中插入记录 INSERT INTO stu VALUES (101,'JAMES','M',01,20,'2014-07-31'), (102,'HOWARD','M',01,24,'2015-07-31'), (103,'SMITH','M',01,22,'2013-03-15'), (201,'ALLEN','F',02,21,'2017-05-01'), (202,'JONES','F',02,23,'2015-07-31'), (301,'KING','F',03,22,'2013-01-01'), (302,'ADAMS','M',03,20,'2014-06-01');       -- 向数据表class中插入记录 INSERT INTO class VALUES (01,'MATH','One','JONH'), (02,'HISTORY','Two','SIMON'), (03,'PHYSICS','Three','JACKSON');    -- 查询每个班级年龄最大的学生 SELECT a.class_id,b.name,MAX(a.age) FROM stu a,class b WHERE a.class_id=b.id GROUP BY a.class_id;    -- 查询学生JAMES所在班级名称和班主任姓名 SELECT a.name,b.name,b.t_name FROM stu a,class b WHERE a.class_id=b.id AND a.name='JAMES';    -- 使用连接查询，查询所有学生的班级信息 SELECT a.id,a.name,b.name FROM stu a,class b WHERE a.class_id=b.id;    -- 在stu表中，计算每个班级各有多少名学生 SELECT b.name,COUNT(*) FROM stu a,class b WHERE a.class_id=b.id GROUP BY b.name;    -- 在stu表中，计算不同班级学生的平均年龄 SELECT b.name,AVG(age) FROM stu a,class b WHERE a.class_id=b.id GROUP BY b.name;    -- 指定所有字段名称插入记录 INSERT INTO students (id,name,sex,class_id,age,login_date)  VALUES(101,'JAMES','M',01,20,'2014-07-31');    -- 不指定字段名称插入记录 INSERT INTO students VALUES (102,'HOWARD','M',01,24,'2015-07-31');    -- 同时插入多条记录 INSERT INTO students VALUES (103,'SMITH','M',01,22,'2013-03-15'), (201,'ALLEN','F',02,21,'2017-05-01'), (202,'JONES','F',02,23,'2015-07-31'), (301,'KING','F',03,22,'2013-01-01'), (302,'ADAMS','M',03,20,'2014-06-01');    -- 将学生JAMES的年龄增加1 UPDATE students SET age=age+1 WHERE name='JAMES';    -- 将学生JAMES的年龄增加1 UPDATE students SET sex='F',login_date='2016-08-31' WHERE name='HOWARD';    -- 删除班级号为01的记录 DELETE FROM students WHERE class_id=01;    -- 创建年龄超过22岁的学生的视图 CREATE VIEW stu_older(id,name,sex,age,login_date) AS SELECT id,name,sex,age,login_date FROM stu WHERE age > 22;    -- 创建01班级的学生的视图 CREATE VIEW stu_class_one (id,name,sex,age,login_date,class_name) AS SELECT a.id,a.name,a.sex,a.age,a.login_date,b.name FROM stu a,class b WHERE class_id=01 AND a.class_id=b.id;    -- 更新学生HOWARD的年龄 UPDATE stu_class_one SET age=age-1 WHERE name='HOWARD';    -- 查看创建的视图 SELECT * FROM information_schema.views\G    -- 删除创建的视图 DROP VIEW stu_orlder;        -- 【存储过程】（p299） -- 创建存储过程 DELIMITER // CREATE PROCEDURE getStuInfo (IN id int(11)) BEGIN SELECT id,a.name,b.name FROM stu a,class b WHERE a.class_id=b.id AND a.id=id; END //    -- 调用存储过程 DELIMITER ; CALL getStuInfo(103);       -- 【触发器】（p338） -- 创建数据表stu_login CREATE TABLE stu_login ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, login_date DATE );    -- 创建数据表stu_years CREATE TABLE stu_years ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, years INT );    -- 创建触发器get_years CREATE TRIGGER get_years AFTER INSERT ON stu_login FOR EACH ROW INSERT INTO stu_years VALUES(NEW.id,NEW.name, YEAR(CURDATE())-YEAR(NEW.login_date));    -- 向stu_login INSERT INTO stu_login VALUES (101,'JAMES','2014-07-31'), (102,'HOWARD','2015-07-31'), (103,'SMITH','2013-03-15');       -- 【索引】（p273） -- 创建学生索引表 CREATE TABLE stu_index ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, sex VARCHAR(2) NOT NULL, age INT NOT NULL, login_date DATE NOT NULL, UNIQUE INDEX uni_idx(id), INDEX multi_idx(name(25),sex(2)) );    -- 创建班级索引表 CREATE TABLE class_index ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, grade VARCHAR(10) NOT NULL, t_name VARCHAR(25) NOT NULL );    -- 添加唯一索引 ALTER TABLE class_index ADD UNIQUE INDEX uni_c_idx(id DESC);    -- 添加普通索引 ALTER TABLE class_index ADD INDEX com_grade_idx(grade);    -- 添加组合索引 CREATE INDEX multi_col_idx ON class_index(name,grade);    -- 删除索引 ALTER TABLE class_index DROP INDEX com_tname_idx;    DROP INDEX multi_col_idx ON class_index;       -- 【用户与权限】（p368） -- 创建新用户 GRANT SELECT,UPDATE(id,name,grade,t_name) ON class TO 'adminNew'@'localhost' IDENTIFIED BY '123' WITH MAX_CONNECTIONS_PER_HOUR 30;    -- 查询账户信息 SELECT host,user,select_priv,update_priv FROM mysql.user WHERE user='adminNew';    -- 查询表权限信息 SELECT host,db,user,table_name,table_priv,column_priv FROM mysql.tables_priv WHERE user='adminNew';    -- 查询列权限信息 SELECT host,db,user,table_name,column_priv,column_priv FROM mysql.columns_priv WHERE user='adminNew';    -- 查看账户的权限信息 SHOW GRANTS FOR 'adminNew'@'localhost';    -- 收回账户权限 REVOKE SELECT,UPDATE ON school.class FROM 'adminNew'@'localhost';    -- 删除用户 DROP USER 'adminNew'@'localhost';       -- 【备份和还原】（p399） -- 使用mysqldump备份 C:\Users\USER>mysqldump -u root -p school students > D:\mysql_backup\students_bk.sql    -- 使用mysqldump还原 SOURCE D:/mysql_backup/students_bk.sql;    -- 数据库备份 SELECT * FROM school.students INTO OUTFILE 'C:/ProgramData/MySQL/MySQL Server 5.7/Uploads/students_out.txt' FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES STARTING BY '<' TERMINATED BY '>\r\n';    -- 数据库还原 LOAD DATA INFILE 'C:/ProgramData/MySQL/MySQL Server 5.7/Uploads/students_out.txt' INTO TABLE school.students FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES STARTING BY '<' TERMINATED BY '>\r\n';-- 创建数据表stu CREATE TABLE stu ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, sex VARCHAR(2) NOT NULL, class_id INT, age INT, login_date DATE );    -- 创建数据表class CREATE TABLE class ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, grade VARCHAR(10) NOT NULL, t_name VARCHAR(25) NOT NULL );    -- 向数据表stu中插入记录 INSERT INTO stu VALUES (101,'JAMES','M',01,20,'2014-07-31'), (102,'HOWARD','M',01,24,'2015-07-31'), (103,'SMITH','M',01,22,'2013-03-15'), (201,'ALLEN','F',02,21,'2017-05-01'), (202,'JONES','F',02,23,'2015-07-31'), (301,'KING','F',03,22,'2013-01-01'), (302,'ADAMS','M',03,20,'2014-06-01');       -- 向数据表class中插入记录 INSERT INTO class VALUES (01,'MATH','One','JONH'), (02,'HISTORY','Two','SIMON'), (03,'PHYSICS','Three','JACKSON');    -- 查询每个班级年龄最大的学生 SELECT a.class_id,b.name,MAX(a.age) FROM stu a,class b WHERE a.class_id=b.id GROUP BY a.class_id;    -- 查询学生JAMES所在班级名称和班主任姓名 SELECT a.name,b.name,b.t_name FROM stu a,class b WHERE a.class_id=b.id AND a.name='JAMES';    -- 使用连接查询，查询所有学生的班级信息 SELECT a.id,a.name,b.name FROM stu a,class b WHERE a.class_id=b.id;    -- 在stu表中，计算每个班级各有多少名学生 SELECT b.name,COUNT(*) FROM stu a,class b WHERE a.class_id=b.id GROUP BY b.name;    -- 在stu表中，计算不同班级学生的平均年龄 SELECT b.name,AVG(age) FROM stu a,class b WHERE a.class_id=b.id GROUP BY b.name;    -- 指定所有字段名称插入记录 INSERT INTO students (id,name,sex,class_id,age,login_date)  VALUES(101,'JAMES','M',01,20,'2014-07-31');    -- 不指定字段名称插入记录 INSERT INTO students VALUES (102,'HOWARD','M',01,24,'2015-07-31');    -- 同时插入多条记录 INSERT INTO students VALUES (103,'SMITH','M',01,22,'2013-03-15'), (201,'ALLEN','F',02,21,'2017-05-01'), (202,'JONES','F',02,23,'2015-07-31'), (301,'KING','F',03,22,'2013-01-01'), (302,'ADAMS','M',03,20,'2014-06-01');    -- 将学生JAMES的年龄增加1 UPDATE students SET age=age+1 WHERE name='JAMES';    -- 将学生JAMES的年龄增加1 UPDATE students SET sex='F',login_date='2016-08-31' WHERE name='HOWARD';    -- 删除班级号为01的记录 DELETE FROM students WHERE class_id=01;    -- 创建年龄超过22岁的学生的视图 CREATE VIEW stu_older(id,name,sex,age,login_date) AS SELECT id,name,sex,age,login_date FROM stu WHERE age > 22;    -- 创建01班级的学生的视图 CREATE VIEW stu_class_one (id,name,sex,age,login_date,class_name) AS SELECT a.id,a.name,a.sex,a.age,a.login_date,b.name FROM stu a,class b WHERE class_id=01 AND a.class_id=b.id;    -- 更新学生HOWARD的年龄 UPDATE stu_class_one SET age=age-1 WHERE name='HOWARD';    -- 查看创建的视图 SELECT * FROM information_schema.views\G    -- 删除创建的视图 DROP VIEW stu_orlder;        -- 【存储过程】（p299） -- 创建存储过程 DELIMITER // CREATE PROCEDURE getStuInfo (IN id int(11)) BEGIN SELECT id,a.name,b.name FROM stu a,class b WHERE a.class_id=b.id AND a.id=id; END //    -- 调用存储过程 DELIMITER ; CALL getStuInfo(103);       -- 【触发器】（p338） -- 创建数据表stu_login CREATE TABLE stu_login ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, login_date DATE );    -- 创建数据表stu_years CREATE TABLE stu_years ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, years INT );    -- 创建触发器get_years CREATE TRIGGER get_years AFTER INSERT ON stu_login FOR EACH ROW INSERT INTO stu_years VALUES(NEW.id,NEW.name, YEAR(CURDATE())-YEAR(NEW.login_date));    -- 向stu_login INSERT INTO stu_login VALUES (101,'JAMES','2014-07-31'), (102,'HOWARD','2015-07-31'), (103,'SMITH','2013-03-15');       -- 【索引】（p273） -- 创建学生索引表 CREATE TABLE stu_index ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, sex VARCHAR(2) NOT NULL, age INT NOT NULL, login_date DATE NOT NULL, UNIQUE INDEX uni_idx(id), INDEX multi_idx(name(25),sex(2)) );    -- 创建班级索引表 CREATE TABLE class_index ( id INT NOT NULL PRIMARY KEY, name VARCHAR(25) NOT NULL, grade VARCHAR(10) NOT NULL, t_name VARCHAR(25) NOT NULL );    -- 添加唯一索引 ALTER TABLE class_index ADD UNIQUE INDEX uni_c_idx(id DESC);    -- 添加普通索引 ALTER TABLE class_index ADD INDEX com_grade_idx(grade);    -- 添加组合索引 CREATE INDEX multi_col_idx ON class_index(name,grade);    -- 删除索引 ALTER TABLE class_index DROP INDEX com_tname_idx;    DROP INDEX multi_col_idx ON class_index;       -- 【用户与权限】（p368） -- 创建新用户 GRANT SELECT,UPDATE(id,name,grade,t_name) ON class TO 'adminNew'@'localhost' IDENTIFIED BY '123' WITH MAX_CONNECTIONS_PER_HOUR 30;    -- 查询账户信息 SELECT host,user,select_priv,update_priv FROM mysql.user WHERE user='adminNew';    -- 查询表权限信息 SELECT host,db,user,table_name,table_priv,column_priv FROM mysql.tables_priv WHERE user='adminNew';    -- 查询列权限信息 SELECT host,db,user,table_name,column_priv,column_priv FROM mysql.columns_priv WHERE user='adminNew';    -- 查看账户的权限信息 SHOW GRANTS FOR 'adminNew'@'localhost';    -- 收回账户权限 REVOKE SELECT,UPDATE ON school.class FROM 'adminNew'@'localhost';    -- 删除用户 DROP USER 'adminNew'@'localhost';       -- 【备份和还原】（p399） -- 使用mysqldump备份 C:\Users\USER>mysqldump -u root -p school students > D:\mysql_backup\students_bk.sql    -- 使用mysqldump还原 SOURCE D:/mysql_backup/students_bk.sql;    -- 数据库备份 SELECT * FROM school.students INTO OUTFILE 'C:/ProgramData/MySQL/MySQL Server 5.7/Uploads/students_out.txt' FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES STARTING BY '<' TERMINATED BY '>\r\n';    -- 数据库还原 LOAD DATA INFILE 'C:/ProgramData/MySQL/MySQL Server 5.7/Uploads/students_out.txt' INTO TABLE school.students FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES STARTING BY '<' TERMINATED BY '>\r\n';