Nested SELECT statements problem

[Pascal Délisle]

Hi!

I try to figure out how to use a nested "SELECT" statement after the
"IN" predicate. For example, when I try this code, it doesn't return
anything although it should:
SELECT book.IDLivre, aut.Prenom, aut.Nom FROM livre book, livreEcritPar
ecr, auteur aut WHERE ecr.IDLivre = book.IDLivre AND aut.IDAuteur =
ecr.IDAuteur AND book.IDLivre IN ("SELECT book.IDLivre FROM livre book,
livreEcritPar ecr, auteur aut WHERE aut.Prenom like '%$firstName%' AND
aut.Nom like '%$name%' AND ecr.IDAuteur = aut.IDAuteur AND book.IDLivre
= ecr.IDLivre");
So, my question is the following: How should I change syntax in order
to make this bunch of code work? I mean, under Oracle SQL, this syntax
would be legal and work perfectly, so I'm confused how to solve my
problem.

Thanks in advance!
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