Mysql multiple ORDER BY with UNION

Я хочу получить данные с заказом по дате. Я использую союз.Mysql multiple ORDER BY with UNION

Я рассмотрел приведенный ниже адрес. Но с этим я не понимаю.

mysql order by with union doesn't seem to work

Мой запрос

(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

Мой результат

+-------+------+---------------------+ 
| 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 | 
+-------+------+---------------------+

В приведенном выше URL заказа дата не работает. Я не хочу делать заказ как обычным. Мне нужен отдельный порядок для обоих выбранных запросов (используется в UNION).

Update 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

выше дает результат ниже.

+-------+------+---------------------+ 
| 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 | 
+-------+------+---------------------+

В результате я не хочу, чтобы изменить порядок столбец «середине»

источник

2016-07-19 Praveen Srinivasan

вы можете добавить 'ORDER BY бновить DESC' в конце запрос перед 'LIMIT 10' – mwafi

Можете ли вы показать нам, что вы хотите получить? –

@mwafi Спасибо за ваш комментарий. Я пробовал это, но не даю ожидаемого результата. –

Попробуйте

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

Установленный порядок по дате только основания или группы

источник

2016-07-19 20:04:27 Nandakumar

Работает как и ожидалось. Благодаря @Nandakumar –

Вам нужно обернуть результат объединения двух отдельных заявлений и заказать его по pdate.

, как показано ниже:

SELECT * from 
    (
     (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) 
    ) as UnionTable 
ORDER BY pdate DESC limit 10

источник

2016-07-19 14:52:04

Вы уверены, что эту работу? Вам не нужен другой заголовок 'SELECT'? и поместить псевдоним в подзапрос? –

@JuanCarlosOropeza Спасибо! –

@JuanCarlosOropeza Спасибо за ваш ответ. Я пробовал это, но не работал. См. Мой вопрос. Обновление 2. –

Я не уверен, почему union даже необходимо. И я не совсем понимаю, каким должно быть значение третьего столбца, потому что это не аргумент функции агрегации и не находится в group by.

Тем не менее, я хотел бы написать запрос как:

(SELECT n.nid, max(na.gid) as mid, fav.field_date_posted_value as pdate 
FROM `node` n JOIN 
     nodeaccess na 
     ON na.nid = n.nid LEFT JOIN 
     field_data_field_date_posted 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 
LIMIT 10 
) UNION ALL 
(SELECT n.nid, max(na.gid) as mid, fav.field_date_posted_value as pdate 
FROM `node` n JOIN 
    nodeaccess na 
    ON na.nid = n.nid LEFT JOIN 
    field_data_field_date_posted 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 
) 
ORDER BY pdate DESC 
LIMIT 10;

Примечания:

Limit подзапросов до 10 строк. Зачем обрабатывать больше данных, чем необходимо?
Использовать ORDER BY после подзапросов, чтобы заказать все результаты.
Используйте UNION ALL вместо UNION, поэтому ваш запрос не несет накладных расходов на удаление дубликатов.

источник

2016-07-19 15:00:23

Создайте еще один столбец, так что вы можете заказать каждый UNION запрос

Sql Fiddle Demo

SELECT '1' as grp, 1 as ID 
UNION 
SELECT '1' as grp, 3 as ID 
UNION 
SELECT '1' as grp, 2 as ID 
UNION 
SELECT '1' as grp, 5 as ID 
UNION 
SELECT '2' as grp, 4 as ID 
UNION 
SELECT '2' as grp, 7 as ID 
UNION 
SELECT '2' as grp, 2 as ID 
UNION 
SELECT '2' as grp, 5 as ID 

ORDER BY grp, ID

OUTPUT

источник

2016-07-19 15:00:35

Два дополнительных пункта ORDER BY могут быть удалены.Фактически, несколько БД только для того, чтобы поставить предложение ORDER BY OR LIMIT перед заявлением Союза. Вы можете попробовать ниже:

(
(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 
) 

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

источник

2016-07-19 15:14:52 user2763088

Mysql multiple ORDER BY with UNION

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