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Editorial Team
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Asked: 2026-05-30T07:04:47+00:00

Yesterday I have been testing one single query for over hours and hours, but

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Yesterday I have been testing one single query for over hours and hours, but I never succeeded. These are the three tables:

USERS:
#### id: 1 ##### name: Admin ##### Hometown: The Hague

POSTS:
#### id: 1 ##### userid: 1 ##### title: Test I ##### opinion: agree
#### id: 2 ##### userid: 1 ##### title: Nope.. ##### opinion: disagree

REACTIONS:
#### id: 1 ##### userid: 1 ##### opinion: agree
#### id: 2 ##### userid: 1 ##### opinion: disagree

And this is what I want:
I want the basic information of the user (name, hometown, etc) and I want to count how much compliments (post – opinion: agree), how much complaints (post – opinion: disagree), how much positive reactions (reaction – opinion: agree) and how much negative reactions (reaction – opinion: disagree) this person has posted.

This is the query I use now:

    SELECT
        u.name, u.hometown,

        SUM(IF(r.opinion="disagree",1,0)) AS agrees
        SUM(IF(r.opinion="disagree",1,0)) AS disagrees,

        SUM(IF(p.opinion="agree",1,0)) AS compliments,
        SUM(IF(p.opinion="disagree",1,0)) AS complaints

    FROM
        users AS u

    LEFT JOIN
        reactions AS r
    ON
        r.userid = u.id

    LEFT JOIN
        posts AS p
    ON
        p.userid = u.id

    WHERE
        u.id = 1

The problem is that this does not give me the correct information. It returns values like 8 positive reactions, though there are only two reactions in the DB.

I think it has something to do with GROUP BY p.id, r.id but I tried that and it did not work… Could someone enlighten me?

Thanks in advance!

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1 Answer

  1. Editorial Team

    Depending on your DBMS, you might be able to do this:

    SELECT
    *,
    (SELECT COUNT(*) FROM POSTS WHERE POSTS.userid = USERS.id and opinion = 'agree') compliments,
    (SELECT COUNT(*) FROM POSTS WHERE POSTS.userid = USERS.id and opinion = 'disagree') complaints,
    (SELECT COUNT(*) FROM REACTIONS WHERE REACTIONS.userid = USERS.id and opinion = 'agree') positive_reactions,
    (SELECT COUNT(*) FROM REACTIONS WHERE REACTIONS.userid = USERS.id and opinion = 'disagree') negative_reactions
FROM USERS
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