Question

I am trying to find the number of different things in my database, using SELECT COUNT(*). The problem is when there are zero —

For example,

SELECT COUNT(*) FROM `images` WHERE `approved` = '1'

If there are no results, I will still get a 0 back and can check $result['COUNT(*)'].

But with this query,

SELECT COUNT(*) , `first_name` , `last_name` , `email`
FROM `images`
WHERE `approved` = '0'
AND (
   `first_name` = ''
   AND `last_name` = ''
   AND `email` = ''
)
GROUP BY `first_name` , `last_name` , `email`

I just get an empty result set.
How can I just get a 0 if there are no results, with this query?

Answer 1

It sounds to me like you want to do the grouping, but just count the ones that are approved.

SELECT COUNT(CASE WHEN approved = '0' THEN 1 END) AS Cnt,
      first_name , last_name , email
FROM images
GROUP BY first_name , last_name , email;