INSERT INTO SELECT 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.备份表数据: create table emp as select * from scott.emp

还原表数据:insert into emp select * from scott.emp

2.复制表结构及其数据:

create table table_name_new as select * from table_name_old

3.只复制表结构:

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

4.或者:

create table table_name_new like table_name_old

5.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

6.如果两个表结构不一样:

insert into table_name_new(column1,column2...) select column1,column2...

from table_name_old pasting

posted @ 2022-05-12 19:44  寒冷的雨呢  阅读(2341)  评论(0编辑  收藏  举报