Question

I have a very simply query like this:

 SELECT users.id, COUNT(others.id) as c
 FROM users JOIN other ON users.id=others.user_id 
 GROUP BY users.id

What I would like to do is to replace the number in c with '' when c=0.

For example, instead of a row like

 # I have this
 1, 0
 2, 1

 # I want c=0 replaced with ''
 1, ''  
 2, 1

How can I do this in MySQL?

Answer 1

Try this:

SELECT users.id, IF(COUNT(others.id) = 0, '', COUNT(others.id)) as c
FROM users JOIN other ON users.id=others.user_id 
GROUP BY users.id