使用 GROUP BY 和 ORDER BY 的 SQL

发布于 2024-12-17 10:35:45 字数 717 浏览 1 评论 0原文

我正在尝试显示一个表中的帖子，该表按另一个表中的某些元值分组，如果选择“最近”订单，则按其他元值或帖子 ID 排序。

我想出的最好的办法是：

SELECT `posts`.`id_post`, 
       m1.value AS REGIUNE, 
       m2.value AS JUDET, 
       m3.value AS LOCALITATE, 
       MAX(`posts`.`id_post`) AS ORDERBY 
FROM `posts`
INNER JOIN `posts_meta` m1
    ON(`posts`.`id_post`=m1.`id_post`)
INNER JOIN `posts_meta` m2
    ON(`posts`.`id_post`=m2.`id_post`)
INNER JOIN `posts_meta` m3
    ON(`posts`.`id_post`=m3.`id_post`)
WHERE
    `posts`.`type` = 'published'
AND ( m1.`meta` = 'regiune' )
AND ( m2.`meta` = 'judet' )
AND ( m3.`meta` = 'localitate' )
GROUP BY  posts.id_post
ORDER BY ORDERBY DESC

然而，只有当我们不按任何元值（m1.value、m2.value 或 m3.value）分组时，这才有效。

原文

I am trying to display posts from a table grouped by certain meta values from another table, and ordered by other meta values or post id if "recent" order is selected.

The best I came up with is:

SELECT `posts`.`id_post`, 
       m1.value AS REGIUNE, 
       m2.value AS JUDET, 
       m3.value AS LOCALITATE, 
       MAX(`posts`.`id_post`) AS ORDERBY 
FROM `posts`
INNER JOIN `posts_meta` m1
    ON(`posts`.`id_post`=m1.`id_post`)
INNER JOIN `posts_meta` m2
    ON(`posts`.`id_post`=m2.`id_post`)
INNER JOIN `posts_meta` m3
    ON(`posts`.`id_post`=m3.`id_post`)
WHERE
    `posts`.`type` = 'published'
AND ( m1.`meta` = 'regiune' )
AND ( m2.`meta` = 'judet' )
AND ( m3.`meta` = 'localitate' )
GROUP BY  posts.id_post
ORDER BY ORDERBY DESC

This however only works if we are not grouping by any meta value (m1.value, m2.value or m3.value).

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

帅的被狗咬 2024-12-24 10:35:45

这个应该可以用...

SELECT `posts`.`id_post`, 
       m1.value AS REGIUNE, 
       m2.value AS JUDET, 
       m3.value AS LOCALITATE, 
       MAX(`posts`.`id_post`) AS ORDERBY 
FROM `posts`
INNER JOIN `posts_meta` m1
    ON(`posts`.`id_post`=m1.`id_post`)
INNER JOIN `posts_meta` m2
    ON(`posts`.`id_post`=m2.`id_post`)
INNER JOIN `posts_meta` m3
    ON(`posts`.`id_post`=m3.`id_post`)
WHERE
    `posts`.`type` = 'published'
AND ( m1.`meta` = 'regiune' )
AND ( m2.`meta` = 'judet' )
AND ( m3.`meta` = 'localitate' )
GROUP BY  1,2,3,4
ORDER BY `posts`.`id_post` DESC

This one should work...

SELECT `posts`.`id_post`, 
       m1.value AS REGIUNE, 
       m2.value AS JUDET, 
       m3.value AS LOCALITATE, 
       MAX(`posts`.`id_post`) AS ORDERBY 
FROM `posts`
INNER JOIN `posts_meta` m1
    ON(`posts`.`id_post`=m1.`id_post`)
INNER JOIN `posts_meta` m2
    ON(`posts`.`id_post`=m2.`id_post`)
INNER JOIN `posts_meta` m3
    ON(`posts`.`id_post`=m3.`id_post`)
WHERE
    `posts`.`type` = 'published'
AND ( m1.`meta` = 'regiune' )
AND ( m2.`meta` = 'judet' )
AND ( m3.`meta` = 'localitate' )
GROUP BY  1,2,3,4
ORDER BY `posts`.`id_post` DESC

回复收藏 0 原文

~没有更多了~