akufen Posted September 27, 2006 Share Posted September 27, 2006 HiI have two tables, person and rating. person contains only an id while rating contains id, person_id, value, and movie_id.Now what I want to do is to query for all the people who have rated two diffferent movies, say with id's 45 and 56.I know how to do this for a single movie at a time with the following query:SELECT person.id AS personId FROM person, rating WHERE person.id = rating.person_id AND rating.value = 5 AND rating.movie_id = 45.But how do I in a single query search for people who have rated both movies 45 and 56 with the value 5?Thanks! Link to comment https://forums.phpfreaks.com/topic/22245-sql-join-question/ Share on other sites More sharing options...
Daen Posted September 27, 2006 Share Posted September 27, 2006 [code]SELECT person.id AS personID FROM person INNER JOIN rating ON person.id=rating.person_id WHERE (rating.movie_id=45 OR rating.movie_id=56) AND rating.value=5[/code]That will return multiple rows for one person, though... Off the top of my head I'm not quite sure how to combine those into just one row. You might try changint the above WHERE clause to something like[code]EXISTS (SELECT COUNT(rating.person_id) WHERE (rating.movie_id=45 OR rating.movie_id=56) AND rating.value=5)[/code]Something like that ought to do it, I think. Link to comment https://forums.phpfreaks.com/topic/22245-sql-join-question/#findComment-99643 Share on other sites More sharing options...
fenway Posted September 27, 2006 Share Posted September 27, 2006 Or use an IN clause:[code]SELECT person.id AS personID FROM person INNER JOIN rating ON person.id=rating.person_id WHERE rating.movie_id IN ( 45, 56 ) AND rating.value=5[/code] Link to comment https://forums.phpfreaks.com/topic/22245-sql-join-question/#findComment-99757 Share on other sites More sharing options...
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