0

Two tables. Post and Tag. Many to Many bi-directional relationship.

Post Table              Tag Table             Post_Tag Pivot Table
---------------         ------------          -----------------
id   content            id   name             id_post   id_tag
---------------         ------------          -----------------
 1   hey there           1    php                1        1
                         2    python             1        2

I want to get all posts with their tags.

I've tried this:

SELECT P.title, T.tag
From Post P
JOIN Tag T
ORDER BY P.id DESC

It works, but it gives duplicates:

hey there, php
hey there, python

Is there a way to group tags together in one row here. Thanks

0

You didn't provide DDL and sample data so we can't test anything. Also, it is not clear what is the join predicate, but I think you are looking for GROUP_CONCAT, something along the lines of (Pseudo code):

SELECT P.Title, GROUP_CONCAT(T.Tag SEPARATOR ',') AS Concatenated_Tags
FROM Post P INNER JOIN Tag T ...
GROUP BY P.Title;

HTH

  • thanks that's what I was looking for, though I need to now somehow make GROUP_CONCAT work with doctrine n i'll be all set. thanks for your help – keaton016 Dec 14 '18 at 18:43

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