Question

I have one table that has fields like

ID   ProductID  CategoryID and lot of columns......

1    1          1
2    1          2
3    2          1
4    2          2
5    2          3

I want to insert all the records in this table to two separate tables that have a structure like

ID    ProductID   (Skip CategoryID column)....
1      1
2      2

And

ID  ProductID  CategoryID

1    1          1
2    1          1
3    2          2
4    2          2
5    2          2

I can easily do this using code but i want to use pure SQL.

Normally i can insert it like

Insert into Table1 select * from Table2

But in this case after for every row there are multiple insert.

Any idea in this regard is appreciable.

Answer 1

If I understand you correctly, your issue is that when you select from the first table into the second table you are getting multiple rows for each product. To get round this you can do something like :

INSERT INTO TABLE2 
SELECT DISTINCT 
    ProductID
    , etc. etc. -- Other columns as required
FROM
    TABLE1

and then to inset into the third table would just require:

INSERT INTO TABLE3
SELECT DISTINCT 
    ProductID
    , CategoryID
FROM
    TABLE1