SELECT
NAME,
(SELECT COUNT(1) FROM MOVIERENTED WHERE MOVIERENTED.MOVIEID=MOVIE.MOVIEID) AS RENTCOUNT
FROM MOVIE
ORDER BY RENTCOUNT;
Some movies in this database have never been rented, how can I select only the movies that have been rented outside of the subquery?
I have tried adding WHERE RENTCOUNT > 0
after the FROM MOVIE
statement.
ORA-00904: "RENTCOUNT": invalid identifier
Best Answer
Simiply use an Inner Join (your current query using a Scalar Subquery is similar to an Outer Join):