Question

Please help whith query. Have a table:

id | u_id | start_date |  end_date  |
-------------------------------------
01 |   7  | 2012-09-05 | 2012-09-23 |
02 |   4  | 2012-09-10 | 2012-09-15 |
03 |   4  | 2012-09-27 | 2012-10-05 |
04 |   5  | 2012-10-01 | 2012-10-09 |
05 |   4  | 2012-10-10 | 2012-10-15 |
06 |   7  | 2012-10-23 | 2012-11-05 |
07 |   5  | 2012-11-05 | 2012-11-12 |
08 |   4  | 2012-11-08 | 2012-11-10 |

I want to select all records where month=10 and max “start_date” from prev month and min “end_date” from next month.
Needed as a result

id | u_id | start_date |  end_date  |
-------------------------------------
03 |   4  | 2012-09-27 | 2012-10-05 |
04 |   5  | 2012-10-01 | 2012-10-09 |
05 |   4  | 2012-10-10 | 2012-10-15 |
06 |   7  | 2012-10-23 | 2012-11-05 |

I don’t understand what i do wrong with this query

SELECT start_date, end_date
FROM _xata_owner 
INNER JOIN (
   SELECT max(start_date) AS date FROM _xata_owner
   GROUP BY DATE_FORMAT(start_date, "%m")
   ) b ON month(b.date)=09
WHERE month(start_date)=10
ORDER BY start_date

Thanks!

Answer 1

So you want:

• Get records where the month in start_date is 10. For that:

  SELECT id, u_id, start_date, end_date
  FROM _xata_owner
  WHERE month(start_date)=10

• Get the max “end_date” where the “start_date” is in the previous month:

  SELECT id, u_id, start_date, end_date
  FROM _xata_owner
  WHERE month(start_date) = 09 AND end_date =
  (SELECT MAX(end_date) FROM _xata_owner WHERE month(start_date) = 09)

• Get the min “end_date” where the “end_date” is in the next month:

  SELECT id, u_id, start_date, end_date
  FROM _xata_owner
  WHERE month(end_date) = 11 AND end_date =
  (SELECT MIN(end_date) FROM _xata_owner WHERE month(end_date) = 11)

Put them all together:

(SELECT id, u_id, start_date, end_date
FROM _xata_owner 
WHERE month(start_date)=10)
UNION
(SELECT id, u_id, start_date, end_date
FROM _xata_owner
WHERE month(start_date) = 09 AND end_date =
        (SELECT MAX(end_date) FROM _xata_owner WHERE month(start_date) = 09))
UNION
(SELECT id, u_id, start_date, end_date
FROM _xata_owner
WHERE month(end_date) = 11 AND end_date =
        (SELECT MIN(end_date) FROM _xata_owner WHERE month(end_date) = 11))

This sounds like what you want anyway. Your question is a little confusing.