MariaDB错误的顺序但在MySQL中是正确的

Question

我的本​​地服务器上有MySQL：5.6.17，生产服务器上有5.5.45-MariaDB-log。 给this fiddle，结果集在本地服务器上正确排序（mysql 5.5和5.6也是如此），但不能在mariadb上生成 - 请参见下面的图片。 任何想法为什么？这是一个mariadb bug吗？

Answer 1

> 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)

尝试：

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;