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
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