Mysql 多个 ORDER BY 和 UNION

Question

我想获取按日期排序的数据。我正在使用联合。

我浏览了以下网址。但我没有得到明确的解决方案。

mysql order by with union doesn't seem to work

我的查询

(SELECT n.nid, 
        Max(na.gid)                 AS mid, 
        fav.field_date_posted_value AS pdate 
 FROM   `node` AS n 
 JOIN nodeaccess AS na 
   ON na.nid = n.nid 
 LEFT JOIN field_data_field_date_posted AS fav 
        ON fav.entity_id = n.nid 
 WHERE  ( na.gid IN( 10, 11 ) 
          AND ( n.status = '1' ) 
          AND ( n.type IN ( 'article', 'blog', 'events', 'media', 
                            'press_releases', 'expert_speak', 'feature', 
                            'case_study', 
                            'news', 'the_igtb_series', 'trend', 'white_paper' ) 
              ) ) 
 GROUP  BY n.nid 
 ORDER  BY pdate DESC) 

UNION 

(SELECT n.nid, 
        Max(na.gid)                 AS mid, 
        fav.field_date_posted_value AS pdate 
 FROM   `node` AS n 
 JOIN nodeaccess AS na 
   ON na.nid = n.nid 
 LEFT JOIN field_data_field_date_posted AS fav 
        ON fav.entity_id = n.nid 
 WHERE  ( na.gid IN( 2 ) 
          AND ( n.status = '1' ) 
          AND ( n.type IN ( 'article', 'blog', 'events', 'media', 
                            'press_releases', 'expert_speak', 'feature', 
                            'case_study', 
                            'news', 'the_igtb_series', 'trend', 'white_paper' ) 
              ) ) 
 GROUP  BY n.nid 
 ORDER  BY pdate DESC) 
LIMIT 
10 

我的结果

+-------+------+---------------------+
| nid   | mid  | pdate               |
+-------+------+---------------------+
| 12472 |   10 | 2015-05-11 00:00:00 |
| 12473 |   10 | 2015-04-03 00:00:00 |
| 12475 |   10 | 2015-06-08 00:00:00 |
| 12476 |   10 | 2015-12-15 01:55:48 |
| 12477 |   10 | 2014-06-30 00:00:00 |
| 12478 |   10 | 2013-12-26 00:00:00 |
| 12482 |   10 | 2014-02-02 00:00:00 |
| 12483 |   10 | 2014-09-01 00:00:00 |
| 12484 |   10 | 2015-12-04 00:00:00 |
| 12485 |   10 | 2015-08-14 00:00:00 |
+-------+------+---------------------+

在上面的 url 中，日期顺序无效。我不想让 order by 一样常见。我需要为两个选择查询单独排序(在 UNION 中使用)。

更新 2:

(SELECT n.nid, max(na.gid) as mid, fav.field_date_posted_value as pdate FROM `node` as n
JOIN nodeaccess AS na ON na.nid = n.nid
LEFT JOIN field_data_field_date_posted AS fav ON fav.entity_id = n.nid
WHERE (na.gid IN(10,11) AND (n.status = '1') AND (n.type IN  ('article','blog', 'events', 'media', 'press_releases', 'expert_speak', 'feature', 'case_study', 'news', 'the_igtb_series', 'trend', 'white_paper')) )
GROUP BY n.nid 
ORDER BY pdate DESC)

UNION

(SELECT n.nid, max(na.gid) as mid, fav.field_date_posted_value as pdate FROM `node` as n
JOIN nodeaccess AS na ON na.nid = n.nid
LEFT JOIN field_data_field_date_posted AS fav ON fav.entity_id = n.nid
WHERE (na.gid IN(2) AND (n.status = '1') AND (n.type IN  ('article','blog', 'events', 'media', 'press_releases', 'expert_speak', 'feature', 'case_study', 'news', 'the_igtb_series', 'trend', 'white_paper')) )
GROUP BY n.nid 
ORDER BY pdate DESC)

ORDER BY pdate DESC LIMIT 10

上面给出了下面的结果。

+-------+------+---------------------+
| nid   | mid  | pdate               |
+-------+------+---------------------+
| 12789 |   11 | 2016-09-26 00:00:00 |
| 12826 |    2 | 2016-07-13 00:00:00 |
| 12845 |    2 | 2016-07-05 00:00:00 |
| 12823 |   10 | 2016-06-21 00:00:00 |
| 12822 |    2 | 2016-06-17 00:00:00 |
| 12821 |   10 | 2016-06-07 00:00:00 |
| 12635 |   10 | 2016-06-07 00:00:00 |
| 12821 |    2 | 2016-06-07 00:00:00 |
| 12633 |   10 | 2016-05-25 02:19:29 |
| 12548 |   10 | 2016-05-20 00:00:00 |
+-------+------+---------------------+

在此结果中，我不想对“mid”列重新排序

Answer 1

试试这个

SELECT n.nid, max(na.gid) as mid,fav.field_date_posted_value, UNIX_TIMESTAMP(fav.field_date_posted_value) as pdate, 1 as ob FROM `node` as n
JOIN nodeaccess AS na ON na.nid = n.nid
LEFT JOIN field_data_field_date_posted AS fav ON fav.entity_id = n.nid
WHERE (na.gid IN(10,11) AND (n.status = '1') AND (n.type IN  ('article','blog', 'events', 'media', 'press_releases', 'expert_speak', 'feature', 'case_study', 'news', 'the_igtb_series', 'trend', 'white_paper')) )
GROUP BY n.nid 


UNION ALL

SELECT n.nid, max(na.gid) as mid,fav.field_date_posted_value, UNIX_TIMESTAMP(fav.field_date_posted_value) as pdate, 2 as ob FROM `node` as n
JOIN nodeaccess AS na ON na.nid = n.nid
LEFT JOIN field_data_field_date_posted AS fav ON fav.entity_id = n.nid
WHERE (na.gid IN(2) AND (n.status = '1') AND (n.type IN  ('article','blog', 'events', 'media', 'press_releases', 'expert_speak', 'feature', 'case_study', 'news', 'the_igtb_series', 'trend', 'white_paper')) )
GROUP BY n.nid  

ORDER BY ob ASC, pdate DESC

修复了仅按日期排序的基础或组