如何複製一些列並同時更改一列？

Question

我想複製第三列和第四列，但更改第二列。我該怎麼辦？我想知道如何編寫sql查詢。謝謝。

例如：

表1：

1, 1, aaa, bbb 

2, 1, ads, bff 

3, 1, awq, bcc 

，我想table1的最後是：

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

這應該工作：

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

Answer 2

你的建議：

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 

結果：

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