I have a bloomp (like a post), when I select it from the database,

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Asked: June 9, 20262026-06-09T11:27:10+00:00 2026-06-09T11:27:10+00:00

I have a bloomp (like a post), when I select it from the database,

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I have a “bloomp” (like a post), when I select it from the database, I SUM the number of comments, likes and if the current user liked.

The problem is with the number of likes and comments. For example:

If the bloomp has 3 likes and 1 comment, the select return that it has 3 likes and 3 comments, and vice-versa.

Here’s my query:

SELECT `bloomps`.`id` AS id,
       `bloomps`.`text` AS text,
       `bloomps`.`date` AS date,
       `images`.`id` AS image_id,
       `videos`.`id` AS video_id,
       `videos`.`provider` AS video_provider,
       `users`.`name` AS author_name,
       `users`.`picture` AS author_picture,
       SUM(CASE WHEN likes.bloomp_id IS NOT NULL THEN 1 ELSE 0 END) AS likes_number,
       SUM(CASE WHEN likes.bloomp_id IS NOT NULL AND likes.author_id = 1 THEN 1 ELSE 0 END) AS liked,
       SUM(CASE WHEN comments.bloomp_id IS NOT NULL THEN 1 ELSE 0 END) AS comments_number
FROM (`bloomps`)
INNER JOIN `users` ON `users`.`id` = `bloomps`.`author_id`
LEFT JOIN `likes` ON `likes`.`bloomp_id` = `bloomps`.`id`
LEFT JOIN `comments` ON `comments`.`bloomp_id` = `bloomps`.`id`
LEFT JOIN `images` ON `images`.`bloomp_id` = `bloomps`.`id`
LEFT JOIN `videos` ON `videos`.`bloomp_id` = `bloomps`.`id`
GROUP BY `bloomps`.`id`
ORDER BY `bloomps`.`id` ASC
LIMIT 10

enter image description here

This query:

SELECT `bloomps`.`id` AS id,
       `bloomps`.`text` AS text,
       `bloomps`.`date` AS date,
       `users`.`name` AS author_name,
       `users`.`picture` AS author_picture,
       SUM(CASE WHEN likes.bloomp_id IS NOT NULL THEN 1 ELSE 0 END) AS likes_number,
       SUM(CASE WHEN likes.bloomp_id IS NOT NULL AND likes.author_id = 1 THEN 1 ELSE 0 END) AS liked,
       SUM(CASE WHEN comments.bloomp_id IS NOT NULL THEN 1 ELSE 0 END) AS comments_number
FROM (`bloomps`)
INNER JOIN `users` ON `users`.`id` = `bloomps`.`author_id`
LEFT JOIN `likes` ON `likes`.`bloomp_id` = `bloomps`.`id`
LEFT JOIN `comments` ON `comments`.`bloomp_id` = `bloomps`.`id`
GROUP BY `bloomps`.`id`
ORDER BY `bloomps`.`id` ASC
LIMIT 10

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1 Answer

Editorial Team · Answer 1 · 2026-06-09T11:27:11+00:00

You have joined more than one tables to the main (bloomps) table and all these have 1-to-many relationship with it. The result is a mini-cartesian join and wrong counts when grouping.

You need to group each one separately in subqueries and then join these to the base table – and no grouping there. Try this:

SELECT 
    b.id
  , b.*                                -- whatever column from `bloomps`
  , COALESCE(l.cnt,0)   AS likes_number,
  , COALESCE(l.liked,0) AS liked,
  , COALESCE(c.cnt,0)   AS comments_number
FROM 
      bloomps AS b
   LEFT JOIN 
      ( SELECT bloomp_id
             , COUNT(*) AS cnt 
             , COUNT(CASE WHEN author_id = 1 THEN 1 END) AS liked
        FROM likes
        GROUP BY bloomp_id
      ) AS l
         ON l.bloomp_id = b.id
   LEFT JOIN 
      ( SELECT bloomp_id
             , COUNT(*) AS cnt 
        FROM comments
        GROUP BY bloomp_id
      ) AS c
         ON c.bloomp_id = b.id
                                         -- no need for GROUP BY
ORDER BY id ASC 
  LIMIT 10 ;

If you don’t want subqueries, you could keep the query with the modifications below. Test which one is more efficient:

SELECT 
    b.id
  , b.test
  , b.date 
  , COUNT(DISTINCT l.id)  AS likes_number,
  , COUNT(DISTINCT CASE WHEN l.author=1 THEN l.id END) AS liked,
  , COUNT(DISTINCT c.id)  AS comments_number
FROM 
      bloomps AS b
   LEFT JOIN 
      likes AS l
         ON l.bloomp_id = b.id
   LEFT JOIN 
      comments AS c
         ON c.bloomp_id = b.id
GROUP BY b.id ASC                  -- MySQL non-standard syntax for
                                   -- GROUP BY b.id 
                                   -- ORDER BY b.id ASC 
  LIMIT 10 ;

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