CODEWITHSUNDEEP
mysqlmariadb
Matúš Matula
Matúš Matula

Reputation: 99

MariaDB wrong order but correct in MySQL

I have MySQL: 5.6.17 on my local server and 5.5.45-MariaDB-log on production server. Giving this fiddle, the resultset is correctly ordered on local server (mysql 5.5 and 5.6 as well), but not on production on mariadb - see image below.. any idea why? is this a mariadb bug?

wrong order in mariadb

Upvotes: 2

Views: 203

Answers (1)

wchiquito
wchiquito

Reputation: 16551

> SELECT NULLIF('2015-11-19 15:08:22', 0);
+----------------------------------+
| NULLIF('2015-11-19 15:08:22', 0) |
+----------------------------------+
| 2015-11-19 15:08:22              |
+----------------------------------+
1 row in set, 1 warning (0.00 sec)

> SHOW WARNINGS;
+---------+------+---------------------------------------------------------+
| Level   | Code | Message                                                 |
+---------+------+---------------------------------------------------------+
| Warning | 1292 | Truncated incorrect DOUBLE value: '2015-11-19 15:08:22' |
+---------+------+---------------------------------------------------------+
1 row in set (0.00 sec)

> SELECT NULLIF('2015-11-19 15:08:22', '0000-00-00 00:00:00');
+------------------------------------------------------+
| NULLIF('2015-11-19 15:08:22', '0000-00-00 00:00:00') |
+------------------------------------------------------+
| 2015-11-19 15:08:22                                  |
+------------------------------------------------------+
1 row in set (0.00 sec)

Try:

SELECT
   e.id,
   e.dt_competition_last_manual_check,
   MAX(ec.dt_created) as m,
   # GREATEST always return NULL if present among arguments
   NULLIF(
      GREATEST(
         COALESCE(MAX(ec.dt_created), '0000-00-00 00:00:00'),
         COALESCE(e.dt_competition_last_manual_check, '0000-00-00 00:00:00')
      )
   , '0000-00-00 00:00:00') AS most_recent_dt_created_or_checked
FROM `estates` AS `e` 
   LEFT JOIN `estates` AS `ec` ON e.id = ec.estates_id_duplicate 
WHERE e.server = 'esk' 
GROUP BY `e`.`id` 
ORDER BY most_recent_dt_created_or_checked DESC;

Upvotes: 2

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