即使没有特定帖子的评论，使用count（）获取mysql中帖子的评论总数也总是返回1。

Question

I have two tables in my database

1.Stories (id,title,content)

2.Comments (id,story_id,comment) here story_id is forigen key refers id in stories table.

In order to get the comments of a particular post i am using this query

SELECT stories.*,COUNT(stories.id) as totalcomment
FROM stories LEFT JOIN comments ON stories.id=comments.story_id  GROUP BY stories.id 

Problem is i will get totalcomment value is 1 even if no comments for a particular post it should be 0 ,but i will get count(storie.id) result as 1

Answer 1

You need to count Comments.story_id and also group by Comments.story_id .

You have more than one comments for each stories, so your result goes always 1 when you group by that stories.id , you need to count the Comments.story_id so that for each stories it counts all the comments at once and also make a group by of it.

SQL

SELECT stories.*,COUNT(Comments.story_id) as totalcomment
FROM stories LEFT JOIN comments ON stories.id=comments.story_id  GROUP BY stories.id, Comments.story_id