Question

我试图从一系列表格中提取多个部分。我将提出一个不太复杂的问题，实际上代表了一个更大的功能/查询

我有wins_category，review，review_like表格。

winning_category = category_id, category_name, id
review = id, header
review_like = id, review_id

我将首先提出一个查询，用于从这5个表中收集计数，共享计数，查看次数，审核。*

SELECT COUNT(DISTINCT a_like.article_like_id) AS likecount, a.* FROM article AS a 
LEFT JOIN article_like AS a_like ON a.id = a_like.article_id 
WHERE a.created_date BETWEEN '2017-07-01 00:00:00' AND '2017-08-01 00:00:00'
GROUP BY a.id 
ORDER BY  likecount 
DESC OFFSET 0 LIMIT 10

现在我们有了我的问题

SELECT 
        COUNT(DISTINCT r_like.review_like_id) AS likecount,
        r.header AS r_header,
        w.category_name

FROM review AS r
LEFT JOIN review_like AS r_like ON r.id = r_like.review_id 
LEFT JOIN winning_category AS w ON r.id = w.category_id 
WHERE r.id = w.category_id
GROUP BY r.id
ORDER BY  likecount;

它说＆＃34;＆＃34; w.category_name＆＃34;必须出现在GROUP BY子句中或用于聚合函数＆＃34; ....

我已经阅读了这篇文章here以及许多类似的帖子，这些帖子没有我需要的内容

任何提示都会很受欢迎

Postgresql复杂查询

0 个答案: