insert into select与 select into from 区别 (mysql不支持 select into from )

select into from 和 insert into select 都是用来复制表

两者的主要区别为: select into from 要求目标表不存在,因为在插入时会自动创建;insert into select from 要求目标表存在。

1. 复制表结构及其数据:

create table table_name_new as select * from table_name_old

2. 只复制表结构:

create table table_name_new as select * from table_name_old where 1=2;

或者:

create table table_name_new like table_name_old

3. 只复制表数据:

如果两个表结构一样:

insert into table_name_new select * from table_name_old

如果两个表结构不一样:

insert into table_name_new(column1,column2...) select column1,column2... from table_name_old
posted @ 2020-10-17 10:11  谢凌  阅读(938)  评论(0编辑  收藏  举报