Question

Hello I have a table structure like this

products_id | model_num | master_model_num
   1        |  cth001   |    0 
   2        |  cth002   |    0
   3        |  cth003   |    cth001
   4        |  cth004   |    cth001
   5        |  cth005   |    0
   6        |  cth006   |    cth002

My Problem

I will provide the products_id to the table and it will get all product ids whoes master_model_num is equal to the model_num of the given products_id

I have tried following query but it doen’t generate the result that I want

SELECT p.products_id 
FROM products p,products pp 
WHERE p.products_id=pp.products_id 
AND p.products_model=pp.products_master_model 
AND p.products_id='1' 

Answer 1

SELECT pp.products_id
    FROM products p
        INNER JOIN products pp
            ON p.model_num = pp.master_model_num
    WHERE p.products_id = '1'