show a zero if group by returns no value

Question

I am trying to get the amount of users signed up in the past 7 days to display on a chart and it would be nice if mysql returned 0 instead of no row. Currently it just returns a

Answer 1

Try:

SELECT DATE_SUB(CURDATE(), INTERVAL i DAY) date_created_at, 
       count(id) 
FROM (SELECT 1 i UNION ALL 
      SELECT 2 UNION ALL 
      SELECT 3 UNION ALL 
      SELECT 4 UNION ALL 
      SELECT 5 UNION ALL 
      SELECT 6 UNION ALL 
      SELECT 7) i
LEFT JOIN user_accts ON  date(created_at) = DATE_SUB(CURDATE(), INTERVAL i DAY)
                   /*AND owner_id = '131'*/
GROUP BY DATE_SUB(CURDATE(), INTERVAL i DAY)