如何复制一些列并同时更改一列？

Question

我想复制第三列和第四列，但更改第二列。我该怎么办？我想知道如何编写sql查询。谢谢。

例如：

表1：

1, 1, aaa, bbb 

2, 1, ads, bff 

3, 1, awq, bcc 

，我想table1的最后是：

1, 1, aaa, bbb 

2, 1, ads, bff 

3, 1, awq, bcc 

4, 2, aaa, bbb 

5, 2, ads, bff 

6, 2, awq, bcc 

（第一列是ID）

Answer 1

这应该工作：

insert into table1 (column2,column3,column4) 
    select 2,column3, column4 
    from table1 where column2 = 1 

Answer 2

你的建议：

select (@cnt:=@cnt + 1) as RowNumber,a.c1,a.c2,a.c3 from 
(select 1 as id, 1 as c1, 'aaa' as c2, 'bbb'as c3 union all 
select 2, 1, 'ads', 'bff' union all 
select 3, 1, 'awq', 'bcc' 

union all 

select 1 as id, 1 as c1, 'aaa' as c2, 'bbb'as c3 union all 
select 2, 1, 'ads', 'bff' union all 
select 3, 1, 'awq', 'bcc') as a 

cross JOIN 

(select @cnt:=0) as tmp 

结果：

1 1 aaa bbb 
2 1 ads bff 
3 1 awq bcc 
4 1 aaa bbb 
5 1 ads bff 
6 1 awq bcc