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

 

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

  

1. 复制表结构及其数据:

  create table table_name_new as select * from table_name_old

2. 只复制表结构:

  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

3. 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

 

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