Mysql—表内容的增删改查01

{student 是表名}

-- 插入数据
INSERT INTO student VALUES(1,‘雄大‘,‘2019-07-15‘);
-- 插入指定数据
INSERT INTO student(pid,tname) VALUES(2,‘兄弟‘);
-- 修改数据
UPDATE student SET pdate=‘1999-01-02‘,tname=‘123‘ WHERE pid=2;
-- 删除数据
DELETE FROM student WHERE pid=2;
-- 全表删除
DELETE FROM student;      （带条件删除，不能删除约束）
TRUNCATE TABLE student;    （不带条件删除，可以删除约束）

6 查询数据

1.全表查询

select * from student

2.查询指定字段数据

select name,id from student

3.查询时添加常量列
SELECT pid AS ‘编号‘,tname AS ‘姓名‘ FROM student;

4.查询时合并列
-- 查询本班的所有同学姓名及总成绩
SELECT sname,(html+js+jquery) AS ‘grade‘ FROM score;

5.查询时去除重复列

select distinct sex from student

select distinct (sex) from student

6.条件查询

select * from student where name=‘李华‘

7.查询成绩不等于20的同学

select * from sorce where grade<>20

8.查询成绩不合格的学生

select * from sorce where grade<60

9.查询成绩在30-80之间的学生

select * from sorce where grade<=80 and grade>=30

select * from sorce where grade between 30 and 80

Mysql—表内容的增删改查01

原文：https://www.cnblogs.com/sunlangui/p/11428225.html