English 中文(简体)
MySQL COUNT
原标题:MySQL COUNT can t count

确实,它能够,但我可以提出质询。

我在此问:

SELECT code.id AS codeid, code.title AS codetitle, code.summary AS codesummary, code.author AS codeauthor, code.date, code.challengeid, ratingItems.*, FORMAT((ratingItems.totalPoints / ratingItems.totalVotes), 1) AS rating, code_tags.*, tags.*, users.firstname AS authorname, users.id AS authorid, GROUP_CONCAT(tags.tag SEPARATOR  ,  ) AS taggroup,
    COUNT(DISTINCT comments.codeid) AS commentcount
FROM (code)
JOIN code_tags ON code_tags.code_id = code.id
JOIN tags ON tags.id = code_tags.tag_id
JOIN users ON users.id = code.author
LEFT JOIN comments ON comments.codeid = code.id
LEFT JOIN ratingItems ON uniqueName = code.id
WHERE `code`.`approved` = 1
GROUP BY code_id
ORDER BY date desc
LIMIT 15 

重要一线是第二行——我先发誓。 我恳请它就某个职位发表评论的次数,但它没有回过正确数目。 例如,有两点评论的内容将回到“1”。 有两个不同的作者提出8项意见后,“1”还会回来。

任何想法?

感谢!

页: 1

http://www.un.org。 无需提及。 当我去除DISTINCT部分时,有两位作者的8项评论“28”返回。 Sorry, I m not a MySQL expert, 而没有真正理解为什么会返回:

最佳回答

页: 1

你们需要其他一些领域对评论进行总结...... 如果是主要的代号钥匙,这就是达到<条码>COUNT(comments.commentid)的途径。

而且,如果每个集团的评论都知道是不同的,那么一个简单的<编码>COUNT(*)就应当发挥作用。

问题回答

暂无回答




相关问题
SQL SubQuery getting particular column

I noticed that there were some threads with similar questions, and I did look through them but did not really get a convincing answer. Here s my question: The subquery below returns a Table with 3 ...

please can anyone check this while loop and if condition

<?php $con=mysql_connect("localhost","mts","mts"); if(!con) { die( unable to connect . mysql_error()); } mysql_select_db("mts",$con); /* date_default_timezone_set ("Asia/Calcutta"); $date = ...

php return a specific row from query

Is it possible in php to return a specific row of data from a mysql query? None of the fetch statements that I ve found return a 2 dimensional array to access specific rows. I want to be able to ...

Character Encodings in PHP and MySQL

Our website was developed with a meta tag set to... <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> This works fine for M-dashes and special quotes, etc. However, I ...

Pagination Strategies for Complex (slow) Datasets

What are some of the strategies being used for pagination of data sets that involve complex queries? count(*) takes ~1.5 sec so we don t want to hit the DB for every page view. Currently there are ~...

Averaging a total in mySQL

My table looks like person_id | car_id | miles ------------------------------ 1 | 1 | 100 1 | 2 | 200 2 | 3 | 1000 2 | 4 | 500 I need to ...

热门标签