如何将多行插入到类似于“For Each”循环的 SQL 表中？

Question

I have a table in SQL with a structure like:

ID_COL	VALUE_1	VALUE_2	VALUE_3
A	2	4	3
A	3	2	5
B	2	8	6
B	4	7	6
B	3	2	1
C	7	9	6
...	...	...	...

For each distinct ID_COL value (A, B, C, etc.) I need to add a row. Every row being inserted will have the same values for the VALUE_X columns. For example, I'll add a row with values A, 1, 2, 3 , B, 1, 2, 3 , etc.

Is there any way to do this programmatically in SQL without having to generate a bunch of separate insert statements? I'm not super familiar with SQL, but in another language like Python I would do a for-each loop on the distinct ID_COL values.

If it makes a difference, this is in SQL Server.

Thanks!

Answer 1

There is no need to resort to looping for this kind of thing. Your question is lacking any real details about your table or what you really want to accomplish. So assuming you want the value 1, 2, 3 along with each distinct value of ID_COL it would be something like this.

insert YourTable
select distinct ID_COL
    , 1
    , 2
    , 3
from YourTable