MySQL: How to get more results with this query WHERE IN

Question

My table for the categories

  table concept_category:
  id   category_title
 -----------------------------
  1     category1_title    
  2     category2_title    
  3     category3_title    
  4     category4_title    
  5     category5_title   

and the table with the concepts

  table concept:
  id   catid  title
 -----------------------------
  1     3,5    title concept1
  2     5      title concept2
  3     2      title_concept3

Now I try to get all the results where the catid is 5. But the result it is giving is only the title_concept 2 and I want both title_concept1 and title_concept2. This is my query

SELECT id, title, catid                                             
FROM concept 
WHERE catid = (5)

Im not seeing what im doing wrong.. can somebody help me?

Answer 1

Use FIND_IN_SET()

SELECT id, title, catid                                       
FROM concept
where find_in_set(5, replace(catid, ' ', '')) > 0

SQLFiddle demo