MySQL 的相关语句(增删改查)(SQLyog软件实现)
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MySQL 的相关语句(增删改查)(SQLyog软件实现)
Jusenr 发表于2年前
MySQL 的相关语句(增删改查)(SQLyog软件实现)
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标题:腾讯云 新注册用户域名抢购1元起>>>   

-- 创建雇员表:emp
CREATE TABLE emp( empno INT,        -- 员工编号
    ename        VARCHAR(50),    -- 员工姓名
    job        VARCHAR(50),    -- 员工工作
    mgr        INT,        -- 领导编号
    hiredate    DATE,        -- 入职日期
    sal        DECIMAL(7,2),    -- 月薪
    comm        DECIMAL(7,2),    -- 奖金
    deptno        INT        -- 部分编号
) ; -- 添加数据
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,'1987-04-19',3000,NULL,20); INSERT INTO emp VALUES(7839,'KING','PRESIDENT',NULL,'1981-11-17',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,'1987-05-23',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); -- 创建学生信息表:stu
CREATE TABLE stu( sid CHAR(6),    -- 学生学号
    sname    VARCHAR(50),    -- 学生姓名
    age    INT,        -- 学生年龄
    gender    VARCHAR(50)    -- 学生性别
); -- 添加数据
INSERT INTO stu VALUES('S_1001', 'liuYi', 35, 'male'); INSERT INTO stu VALUES('S_1002', 'chenEr', 15, 'female'); INSERT INTO stu VALUES('S_1003', 'zhangSan', 95, 'male'); INSERT INTO stu VALUES('S_1004', 'liSi', 65, 'female'); INSERT INTO stu VALUES('S_1005', 'wangWu', 55, 'male'); INSERT INTO stu VALUES('S_1006', 'zhaoLiu', 75, 'female'); INSERT INTO stu VALUES('S_1007', 'sunQi', 25, 'male'); INSERT INTO stu VALUES('S_1008', 'zhouBa', 45, 'female'); INSERT INTO stu VALUES('S_1009', 'wuJiu', 85, 'male'); INSERT INTO stu VALUES('S_1010', 'zhengShi', 50, 'female'); INSERT INTO stu VALUES('S_1011', 'xxx', NULL, NULL); -- 创建部分表:dept
CREATE TABLE dept( deptno INT,        -- 部分编码
    dname    VARCHAR(14),    -- 部分名称
    loc    VARCHAR(13)    -- 部分所在地点
); -- 添加数据
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'); -- 查询所有列
SELECT * FROM stu; -- 删除数据
DELETE FROM stu WHERE sid = 'sunQi' ; -- 查询指定列
SELECT sname,age FROM stu; -- 查询性别为女,并且年龄为50的记录
SELECT * FROM stu WHERE gender='female' AND age=50; -- 查询学号为S_1001,或者姓名为liSi的记录
SELECT * FROM stu WHERE sid='s_1001' OR sname='lisi'; -- 查询学号为S_1001,S_1002,S_1003的记录
SELECT * FROM stu WHERE sid IN ('s_1001','s_1002','s_1003' ); -- 查询学号不是S_1001,S_1002,S_1003的记录
SELECT * FROM stu WHERE sid NOT IN ('s_1001','s_1002','s_1003' ); -- 查询年龄为null的记录
SELECT * FROM stu WHERE age IS NULL; -- 查询年龄在20到40之间的学生记录
SELECT * FROM stu WHERE age BETWEEN 20 AND 40; -- 或者
SELECT * FROM stu WHERE age>=20 AND age<=40; -- 查询性别非男的学生记录
SELECT * FROM stu WHERE gender !='male'; -- 或者
SELECT * FROM stu WHERE gender <>'male'; -- 查询姓名不为null的学生记录
SELECT * FROM stu WHERE sname IS NOT NULL; -- 或者
SELECT * FROM stu WHERE NOT sname IS NULL; -- 查询姓名由5个字母构成的学生记录
SELECT * FROM stu WHERE sname LIKE '_____'; -- 查询姓名由5个字母构成,并且第5个字母为“i”的学生记录
SELECT * FROM stu WHERE sname LIKE '____i'; -- 查询姓名以“z”开头的学生记录
SELECT * FROM stu WHERE sname LIKE 'z%'; -- 查询姓名中第2个字母为“i”的学生记录
SELECT * FROM stu WHERE sname LIKE '_i%'; -- 查询姓名中包含“a”字母的学生记录
SELECT * FROM stu WHERE sname LIKE '%a%'; -- 去除重复记录
SELECT DISTINCT * FROM stu; -- 查询所有列
SELECT * FROM emp; -- 查看雇员的月薪与佣金之和
SELECT *,sal+comm FROM emp; -- 或者
SELECT *,sal+IFNULL(comm,0) FROM emp; -- 给列名添加别名
SELECT *, sal+IFNULL(comm,0) AS total FROM emp; -- 或者
SELECT *,sal+IFNULL(comm,0) total FROM emp; -- 查询所有学生记录,按年龄升序排序
SELECT * FROM stu ORDER BY age; SELECT * FROM stu ORDER BY age ASC; -- 查询所有学生记录,按年龄降序排序
SELECT * FROM stu ORDER BY age DESC; -- 查询所有雇员,按月薪降序排序,如果月薪相同时,按编号升序排序
SELECT * FROM emp ORDER BY sal DESC,empno ASC; -- 查询emp表中记录数
SELECT COUNT(*) AS cnt FROM emp; -- 查询emp表中有佣金的人数
SELECT COUNT(comm) AS cnt FROM emp; -- 查询emp表中月薪大于2500的人数
SELECT COUNT(*) AS cnt FROM emp WHERE sal > 2500; -- 统计月薪与佣金之和大于2500元的人数
SELECT COUNT(*) AS cnt FROM emp WHERE sal+IFNULL(comm,0) > 2500; -- 查询有佣金的人数,以及有领导的人数
SELECT COUNT(comm), COUNT(mgr) FROM emp; -- 查询所有雇员月薪和
SELECT SUM(sal) FROM emp; -- 查询所有雇员月薪和,以及所有雇员佣金和
SELECT SUM(sal),SUM(comm) FROM emp; -- 查询所有雇员月薪+佣金和
SELECT SUM(sal+IFNULL(comm,0)) FROM emp; -- 统计所有员工平均工资
SELECT AVG(sal) FROM emp; -- 查询最高工资和最低工资
SELECT MAX(sal),MIN(sal) FROM emp; -- 查询每个部门的部门编号和每个部门的工资和
SELECT deptno, SUM(sal) FROM emp GROUP BY deptno; -- 查询每个部门的部门编号以及每个部门的人数
SELECT deptno, COUNT(*) AS cnt FROM emp GROUP BY deptno; -- 查询每个部门的部门编号以及每个部门工资大于1500的人数
SELECT deptno, COUNT(*) FROM emp WHERE sal>1500 GROUP BY deptno; -- 查询工资总和大于9000的部门编号以及工资和
SELECT deptno, SUM(sal) FROM emp GROUP BY deptno HAVING SUM(sal) > 9000; -- 

-- 查询所有列
SELECT * FROM dept; -- 创建学生信息表 student
CREATE TABLE student( sid INT,        -- 学号
    sname         VARCHAR(20),    -- 姓名
    age        INT,        -- 年龄
    scores        INT,        -- 成绩
    gender        VARCHAR(6),    -- 性别
    birthday    DATE        -- 出生日期
); -- 添加数据
INSERT INTO student(sid,sname,age,scores,gender) VALUES (0001,'张华',23,49,''); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0007,'孙萌',20,59,'','1997-02-24'); INSERT INTO student(sid,sname,age,scores,gender) VALUES (0002,'李四',28,69,''); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0009,'吴笑清',22,68,'','1994-11-02'); INSERT INTO student(sid,sname,age,scores,gender) VALUES (0003,'王小花',26,29,''); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0004,'赵六',22,85,'','1990-12-17'); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0005,'钱雨',21,87,'','1992-03-30'); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0006,'李四',25,83,'','1996-05-13'); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0008,'周董',27,99,'','1995-07-23'); INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (00010,'郑源',27,79,'','1994-08-23'); -- 查询所有列
SELECT * FROM student; -- 删除表 student
DROP TABLE student; -- 去除重复记录
SELECT DISTINCT * FROM student; -- 显示mydb下的所有表
USE mydb; SHOW TABLES; -- 

-- 创建表:定义列之后独立指定主键
CREATE TABLE stu1( sid CHAR(6), sname VARCHAR(20), age INT, gender VARCHAR(10), PRIMARY KEY(sid) ); -- 创建表:指定主键且自增长
CREATE TABLE stu11( sid INT(6) PRIMARY KEY AUTO_INCREMENT, sname VARCHAR(20), age INT, gender VARCHAR(10) ); -- 添加数据(表:stu1或者stu11)
INSERT INTO stu11(sname,age,gender) VALUE ('张三',23,''); INSERT INTO stu11(sname,age,gender) VALUE ('李四',24,''); INSERT INTO stu11(sname,age,gender) VALUE ('李思思',26,''); INSERT INTO stu11(sname,age,gender) VALUE ('景甜',27,''); INSERT INTO stu11(sname,age,gender) VALUE ('刘亦菲',29,''); INSERT INTO stu11(sname,age,gender) VALUE ('刘诗诗',25,''); -- 删除数据
DELETE FROM stu11 WHERE sname='刘诗诗'; -- 查询所有列
SELECT * FROM stu11; -- 修改表时指定主键
ALTER TABLE stu ADD PRIMARY KEY(sid); -- 修改表时设置主键自增长
ALTER TABLE stu11 CHANGE sid sid INT AUTO_INCREMENT; -- 修改表时删除主键自增长
ALTER TABLE stu11 CHANGE sid sid INT; -- 删除主键(只是删除主键约束,而不会删除主键列)
ALTER TABLE stu DROP PRIMARY KEY; -- 

-- 创建用户信息表 user,并指定主键且自增长
CREATE TABLE USER( uid INT PRIMARY KEY AUTO_INCREMENT, username VARCHAR(32), userpassword VARCHAR(32) ); -- 查询所有列
SELECT * FROM USER; -- 删除表 
DROP TABLE USER; -- 添加数据
INSERT INTO USER(username,userpassword) VALUE ('zhangsan','123'); INSERT INTO USER(username,userpassword) VALUE ('lisi','1234'); INSERT INTO USER(username,userpassword) VALUE ('wangwu','234'); INSERT INTO USER(username,userpassword) VALUE ('zhaoliu','1234'); INSERT INTO USER(username,userpassword) VALUE ('sisi','234'); -- 删除数据
DELETE FROM USER WHERE username='lisi';

 

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