mysql切换张华_MySQL 的相关语句（增删改查）（SQLyog软件实现）

MySQL 的相关语句(增删改查)(SQLyog软件实现)

— 创建雇员表：emp

CREATE TABLE emp(

empno        INT,        — 员工编

ename        VARCHAR(50),    — 员工姓名

job        VARCHAR(50),    — 员工工作

mgr        INT,        — 领导编

hiredate    DATE,        — 入职日期

sal        DECIMAL(7,2),    — 月薪

comm        DECIMAL(7,2),    — 奖金

deptno        INT        — 部分编

) ;

— 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

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;

— 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 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 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 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

— 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 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 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 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 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 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

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,’女’);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0007,’孙萌’,20,59,’女’,’1997-02-24′);

INSERT INTO student(sid,sname,age,scores,gender) VALUES (0002,’李四’,28,69,’男’);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0009,’吴笑清’,22,68,’女’,’1994-11-02′);

INSERT INTO student(sid,sname,age,scores,gender) VALUES (0003,’王小花’,26,29,’女’);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0004,’赵六’,22,85,’男’,’1990-12-17′);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0005,’钱雨’,21,87,’女’,’1992-03-30′);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0006,’李四’,25,83,’男’,’1996-05-13′);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (0008,’周董’,27,99,’男’,’1995-07-23′);

INSERT INTO student(sid,sname,age,scores,gender,birthday) VALUES (00010,’郑源’,27,79,’男’,’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;

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