Question

Table structure:

activities id, name, tagId

activitiesTags id, title

activitiesReactions id, activityId, message

The query now:

SELECT A.id as activityId, A.name, A.tagId, T.id, T.title, COUNT(R.id)
FROM activities A
LEFT JOIN activitiesTags T
ON A.tagId = T.id
LEFT JOIN activitiesReactions R
ON R.activityId = A.id
GROUP BY A.id
ORDER BY A.id DESC
LIMIT ?

The problem is that I’m getting a reactionCount, but it is far from true, It seems that when an activity has an reaction, it times (*) the amount of actual reactions by two.

Does anyone know where the problem might be? Maybe the ORDER BY after GROUP BY?

Thanks

Answer 1

@knittl

Some modification to your query:

SELECT a.* , group_concat(T.title)
FROM ( 
    SELECT A.id as activityId, A.name, A.tagId, T.id, T.title, COUNT(R.id) 
    FROM activities A 
    LEFT JOIN activitiesReactions R 
    ON R.activityId = A.id 
    GROUP BY A.id 
    ORDER BY A.id DESC 
    LIMIT ? 
) a 
LEFT JOIN activitiesTags T 
ON a.tagId = T.id 

group_concat will display all tags with delimiter (“,”). your query will display only the first one.