Home Database Mysql Tutorial Oracle 把一个表中的数据插入到另外一个表中

Oracle 把一个表中的数据插入到另外一个表中

Jun 07, 2016 pm 05:10 PM

1.在oracle中可以用下面两种:01: create table newtable as select * from oldtable;//用于复制前未创建新表newtable不存

1.在Oracle中可以用下面两种:

01:
     create table newtable   as select * from oldtable;//用于复制前未创建新表newtable不存在的情况
02:
      insert into newtable   select * from oldtable;//已经创建了新表newtable 的情况

注意:第一种方式只是复制了表结构,,但是主键什么的并没有复制进去,所以用的时候要小心在意。

2.如果想简单快速的复制表结构,而不需要oldtable里面的数据,可以用下面的语句:

    create table newtable   as  select * from oldtable where 1=2;(把数据过滤掉)

3.如过newtable 和oldtable的表结构不同,可以使用下面的方式:

 create table newtable  as select  s.c1,s.c2  from oldtable s;

 

4.如果想重新命名newtable的列名:

在oracle中:

 create table  newtable(id,name1) as select  s.c1,s.c2  from oldtable s;

或者

 create table  newtable as select  s.c1 ,s.c2  from oldtable s;

在mysql中恐怕只能用第二种方式了。

5.如果是只需要把一部分的oldtable中的数据添加到newtable中。可以这样:

 create table newtable   as (select * from oldtable where ...);//加where过滤条件

6.最常见的情况是id列新表中要用,并且和旧表中的不同,使用下面的语句就可以了(我们可以重新建一个sequence)

create table yang(id,name) as select hibernate_sequence.nextval,t.ename from emp t;

7.要注意,导出表的时候不能用select...into语句。

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