Question

i have a table company row like this :

id(int)	name(string)	maincategory(int)	subcategory(string)
1	Google	1	1,2,3
2	yahoo	4	4,1

and other table category like:

id(int)	name(string)
1	Search
2	Email
3	Image
4	Video

i want to join tow table by company.subcategory = category.id

is it possible in sql ?

Answer 1

Start by splitting your subcategory column. In the end you should have an additional company_category table with company_id and category_id as columns.

 company_id(int) |category_id(int)  
 1               |1
 1               |2
 1               |3
 2               |4
 2               |1