使用SUM和順序進行MySQL查詢

Question

我的查詢出了什么問題？ 有人可以幫我嗎？

我收到此錯誤消息

“'order子句'中的未知列'wp_gdsr_data_article。（SUM（user_voters）+ SUM（visitor_voters））'”

但是' wp_gdsr_data_article '列存在

    SELECT *
    FROM `wp_posts`
    INNER JOIN wp_term_relationships ON wp_term_relationships.object_id = ID AND wp_term_relationships.term_taxonomy_id = 1
    INNER JOIN wp_gdsr_data_article ON post_id = ID
    WHERE `post_status` = 'publish'
    AND `post_type` = 'post'
    ORDER BY `wp_gdsr_data_article`.`(SUM(user_voters)+SUM(visitor_voters))` DESC
    LIMIT 1 , 30

Answer 1

您在ORDER子句中使用的表達式不是表的列。
因此，您不能在表達式的結果上使用表標識符。

錯了

ORDER BY `wp_gdsr_data_article`.`(SUM(user_voters)+SUM(visitor_voters))` DESC

更改為：

ORDER BY (SUM(user_voters)+SUM(visitor_voters)) DESC

而且，您不能像這樣在ORDER BY子句中直接使用任何聚合函數。
分別計算SUM...部分，然后在ORDER BY使用。

SELECT * from (
    SELECT *, (SUM(user_voters)+SUM(visitor_voters)) total
    FROM `wp_posts`
    INNER JOIN wp_term_relationships 
            ON wp_term_relationships.object_id = ID 
               AND wp_term_relationships.term_taxonomy_id = 1
    INNER JOIN wp_gdsr_data_article 
            ON post_id = ID
    WHERE `post_status` = 'publish'
      AND `post_type` = 'post'
    LIMIT 1 , 30
) results
ORDER BY total

請參閱 ： 如何在MySQL中按SUM（）進行訂購？

Answer 2

刪除語句中所有列和表名的引號。 除了按部分訂購應該基於我們語句中的列或評估值之外，使用方式也是錯誤的。 您需要先評估在按順序使用部分中使用的零件，然后再將其用於按順序排列，這是這樣的（未經測試）：

SELECT (SUM(wp_gdsr_data_article.user_voters)+SUM(wp_gdsr_data_article.visitor_voters) as total_voters), *
FROM wp_posts 
  INNER JOIN wp_term_relationships 
     ON wp_term_relationships.object_id = ID 
       AND wp_term_relationships.term_taxonomy_id = 1
  INNER JOIN wp_gdsr_data_article 
     ON post_id = ID
WHERE post_status = 'publish' AND post_type = 'post'
ORDER BY total_voters DESC
LIMIT 1 , 30

Answer 3

嘗試這個

SELECT *, (SUM(wp_gdsr_data_article.user_voters)+SUM(wp_gdsr_data_article.visitor_voters)) AS someSum
FROM `wp_posts`
INNER JOIN wp_term_relationships ON wp_term_relationships.object_id = ID AND wp_term_relationships.term_taxonomy_id = 1
INNER JOIN wp_gdsr_data_article ON post_id = ID
WHERE `post_status` = 'publish'
AND `post_type` = 'post'
ORDER BY someSum DESC
LIMIT 1 , 30