Question

I have this sql search query that works, but it only works if votes exist in the votes table.

mysql_query("SELECT m.Title, r.Subject, SUM(v.IsGood) AS Good, SUM(v.IsBad) AS Bad
    FROM Movies m
        JOIN Reviews r
            ON m.ID=r.MovieID
        JOIN Votes v
        ON r.ID=v.ReviewID
    WHERE (m.Title LIKE '%" . $search . "%' OR r.Subject LIKE '%" . $search . "%')
        GROUP BY m.Title, r.Subject
    ORDER BY SUM(v.IsGood) DESC, SUM(v.IsBad) ASC LIMIT 10")

So I’ve changed it to this below so that no matter if there is 0 votes it should still show. But it doesn’t pull any results, can anyone tell me what am I doing wrong?

mysql_query("SELECT m.Title, r.Subject, COUNT(v.ReviewID) AS Rvotes, SUM(v.IsGood) AS Good, SUM(v.IsBad) AS Bad
    FROM Movies m
        JOIN Reviews r
            ON m.ID=r.MovieID
        JOIN Votes v
        ON r.ID=v.ReviewID
    WHERE (m.Title LIKE '%" . $search . "%' OR r.Subject LIKE '%" . $search . "%')
        GROUP BY m.Title, r.Subject, v.ReviewID
            HAVING Rvotes >= 0
    ORDER BY SUM(v.IsGood) DESC, SUM(v.IsBad) ASC LIMIT 10")

Answer 1

Assuming that you want results even when no votes exist in the votes tables, LEFT JOIN the votes table.

mysql_query("SELECT m.Title, r.Subject, SUM(v.IsGood) AS Good, SUM(v.IsBad) AS Bad
    FROM Movies m
        JOIN Reviews r
            ON m.ID=r.MovieID
        LEFT JOIN Votes v
        ON r.ID=v.ReviewID
    WHERE (m.Title LIKE '%" . $search . "%' OR r.Subject LIKE '%" . $search . "%')
        GROUP BY m.Title, r.Subject
    ORDER BY SUM(v.IsGood) DESC, SUM(v.IsBad) ASC LIMIT 10")

Note: I’ve modified your initial query (not the second) as you said it still didn’t provide what you wanted.