mysql php grouping by a category name

Question

Quick brief: Just now I currently get a list of results by using the below code. I am trying to group my u_feed results by c_feed id 's.

$uid = '15';

SELECT u.uid, u.fid, f.url,f.icon, u.title, f.favicon, f.domain FROM u_feed u INNER JOIN feed f ON f.id = u.fid WHERE u.uid = '$uid'

I have just added a table called c_feed which will hold the name and uid of each category. The u_feed table will then use the column cid to check c_feed for the id .

table c_feed

table feed

table u_feed

I tried SELECT u.uid, u.fid, f.url, f.icon, u.title, f.favicon, f.domain, c.cname FROM u_feed u INNER JOIN feed f ON f.id = u.fid INNER JOIN c_feed c ON c.id = u.cid WHERE u.uid = '15' LIMIT 0 , 30

This only returned

But it should have 11 rows (image below without grouping)

Answer 1

It is your inner join which only include the record if there is an associated record in c_feed. So the only records you got back were the two WITH a cid .

You might be looking for left join s.

SELECT u.uid, u.fid, f.url, f.icon, u.title, f.favicon, f.domain, c.cname 
FROM u_feed u 
LEFT JOIN feed f ON f.id = u.fid 
LEFT JOIN c_feed c ON c.id = u.cid 
WHERE u.uid = '15' LIMIT 0 , 30