MySQL show count of 0 for dates with no records

Question

I\'m trying to get the COUNT of all users attempts by a list of the current week (last 7 days)

This query works but doesnt return 0 if the day not exist:

Answer 1

Create a calendar table or you could try:

SELECT COUNT(*) AS attempt_count,
       DATE_FORMAT(ca_date,'%Y/%m/%d') AS attempt_date
FROM
  (SELECT STR_TO_DATE('2014/06/19', '%Y/%m/%d') ca_date
   UNION ALL SELECT STR_TO_DATE('2014/06/18', '%Y/%m/%d') ca_date
   UNION ALL SELECT STR_TO_DATE('2014/06/17', '%Y/%m/%d') ca_date
   UNION ALL SELECT STR_TO_DATE('2014/06/16', '%Y/%m/%d') ca_date
   UNION ALL SELECT STR_TO_DATE('2014/06/15', '%Y/%m/%d') ca_date
   UNION ALL SELECT STR_TO_DATE('2014/06/14', '%Y/%m/%d') ca_date
   UNION ALL SELECT STR_TO_DATE('2014/06/13', '%Y/%m/%d') ca_date) AS calendar
LEFT JOIN users_attempts ON users_attempts.attempt_date = calendar.ca_date
GROUP BY calendar.ca_date
ORDER BY calendar.ca_date DESC;