MySQL 关于表复制 insert into 语法的详细介绍

复制代码 代码如下:

create table insertTest(id int(4),name varchar(12));
insert into insertTest values(100,‘liudehua');
insert into insertTest values(101,‘zhourunfa');
insert into insertTest values(102,‘zhouhuajian');

复制代码 代码如下:

insert into insertTest select * from insertTest2;

复制代码 代码如下:

INSERT INTO 目标表 (字段1, 字段2, …) SELECT 字段1, 字段2, … FROM 来源表; 

复制代码 代码如下:

insert into insertTest2(id) select id from insertTest2;

复制代码 代码如下:

 INSERT INTO 目标表 
 (字段1, 字段2, …) 
 SELECT 字段1, 字段2, … 
 FROM 来源表 
 WHERE not exists (select * from 目标表 
 where 目标表.比较字段 = 来源表.比较字段);

复制代码 代码如下:

insert into insertTest2
(id,name)
select id,name
from insertTest
where not exists (select * from insertTest2
where insertTest2.id=insertTest.id);

复制代码 代码如下:

insert into insertTest
(id, name)
SELECT 100, ‘liudehua'
FROM dual
WHERE not exists (select * from insertTest
where insertTest.id = 100);