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sql select into from还是insert into select

sql select into from还是insert into select

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