Question

thanks for taking the time to read this.

Essentially I have 3 tables. Posts, Follows, Artists. What I am trying to do is pull all the ‘Posts’ from ‘Artists’ that the user ‘Follows’. I am passing the user_id in, and trying to pull data from ‘Posts’ and ‘Artists’

Posts /* the posts table */
id
body
artist_id
timecode

Follows /* the follows table */
id
artist_id
user_id

Artists /* the artists table */
id
name

So, my basic query starts out like this:

SELECT Posts.id,Posts.body,Posts.timecode,Artists.id AS artist_id,Artists.name
FROM Posts,Artists
LEFT JOIN Artists
ON Posts.artist_id = Artists.id

Now this is where I start to get confused. I am guessing that I need another JOIN statement on the “Follows” table so that I limit the returned results to rows that have a “follows” entry with both the user_id and artist_id.

ie:

RIGHT JOIN Follows
ON Posts.artist_id = Follows.artist_id
WHERE Follows.user_id = :userid

My problem is that I’m not really even sure how to write this properly, although I feel like i’m on the right track here… sorta

ANY help would be much appreciated!!! Thanks.

EDIT Please note I am pulling data from both the Posts and Artists tables, not just the Posts table. Not sure if this makes a big difference.

Answer 1

SELECT p.id,p.body,p.timecode,a.id AS artist_id,a.name
FROM Posts p
INNER JOIN Follows f ON p.artist_id = f.artist_id
INNER JOIN Artists a ON f.artist_id = a.id
WHERE f.user_id = X

Haven’t checked the syntax I hope it is ok.