select into from 和 insert into select都是用來複製表,table
二者的主要區別爲:select
select into from 要求目標表不存在,由於在插入時會自動建立。數據
insert into select from 要求目標表存在tab
備份表數據:備份
create table emp as select * from scott.empco
還原表數據:new
insert into emp select * from scott.empab
1. 複製表結構及其數據:
create table table_name_new as select * from table_name_old
2. 只複製表結構:
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. 只複製表數據:
若是兩個表結構同樣:
insert into table_name_new select * from table_name_old
若是兩個表結構不同:
insert into table_name_new(column1,column2...) select column1,column2... from table_name_old