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Question

I want to do search where c_id 3 then i will get product2. Again If i search c_id 1 then i will get product1, product3

Here is my table structure

p_id    p_name     c_id
------------------------
      |          | 
1     | Product1 |   1
      |          |
2     | Product2 |   2,3,4
      |          |
2     | Product3 |   1,2

Answer 1

You can use find_in_set() ,

select * from products where find_in_set(1,c_id);

OR

select * from products where find_in_set(3,c_id);

SQL DEMO

Answer 2

SQL DEMO

  SELECT *
  FROM YourTable
  WHERE CONCAT(',' , c_id, ',') like CONCAT('%,', @search_id, ',%')

Answer 3

Using FIND_IN_SET could be an option in the meantime .

SELECT *
FROM Table_Name
WHERE FIND_IN_SET('specific c_id you are searching for', c_id);