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Asked: 2026-06-16T00:05:52+00:00

I have two tables USERS and CALENDER, in calender table user place his availability

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I have two tables “USERS” and “CALENDER”, in calender table user place his availability dates, mean 1-to-many relationship.

Now i want to get user list by availability date (today date mean available for today), i.e: i want to show those user who are available today on the top, then those user who’s availability in future and then show those user who haven’t any availability (i.e: no record in calender).

I am trying with below query:

SELECT u.first_name, c.date
FROM  users AS u
LEFT JOIN calendar AS c ON (c.uid = u.id)
GROUP BY u.id
ORDER BY DATE(c.date) ASC

but this will give me record by start by those user who have not any availability in calender and then those who have availability but in past. The results are given below:

User1   NULL                                          User13    2012-12-12 00:00:00
User2   NULL                                          User12    2012-12-12 00:00:00
User3   NULL                                          User10    2012-12-23 00:00:00                      
User4   NULL                                          User10    2012-12-24 00:00:00
User5   NULL                                          User9     2012-12-25 00:00:00
User6   NULL                 - Want To look this =>   User8     2012-12-27 00:00:00
User7   2012-09-20 00:00:00                           User7     2012-12-28 00:00:00
User8   2012-09-29 00:00:00                           User1     NUL
User9   2012-10-25 00:00:00                           User2     NUL
User10  2012-10-26 00:00:00                           User3     NUL
User11  2012-10-27 00:00:00                           User4     NUL
User12  2012-12-05 00:00:00                           User5     NUL
User13  2012-12-10 00:00:00                           User6     NUL
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1 Answer

  1. Editorial Team

    This problem can be solve by putting sub-query and get the future dates and then in ascending form will show exactly like in question, i.e: all available date record on the top then some future record and then show null value (if someone have no dates in calender).

    SELECT u.first_name, 
 (
  SELECT DATE( c.date ) FROM calendar AS c
  WHERE c.uid = u.id
  AND DATE( c.date ) >= CURDATE( )
  ORDER BY DATE( c.date ) ASC
  LIMIT 1
) AS availability
FROM users AS u
GROUP BY u.id
ORDER BY IF( availability IS NULL , 1, 0 ) , availability
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