select into from和insert into select都是用来复制表,两者有什么区别
的有关信息介绍如下:select into from 和 insert into select都乱正配是用来复制表,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。
备份表数据: create table emp as select * from scott.emp
还哗指原表数据:insert into emp select * from scott.emp
复制表结构及其数据:
create table table_name_new as select * from table_name_old
只复制表结清改构:
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
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 pasting