Merci d'avoir mis à jour la requête ; maintenant nous pouvons voir que la condition WHERE n'est appliquée qu'au dernier Requête UNIONnée. Vous devez soit ajoutez cette clause WHERE à chaque requête, ou encapsulez-la dans une sous-sélection et appliquez-y la clause WHERE.
select s.id as id, s.email as email, s.password as password, s.role as role from tblStudents s
where email = "[email protected]"
union
select a.id as id, a.email as email, a.password as password, a.role as role from tblAdmin a
where email = "[email protected]"
union
select t.id as id, t.email as email, t.password as password, t.role as role from tblTeachers t
where email = "[email protected]"
ou
SELECT * FROM (
select s.id as id, s.email as email, s.password as password, s.role as role from tblStudents s
union
select a.id as id, a.email as email, a.password as password, a.role as role from tblAdmin a
union
select t.id as id, t.email as email, t.password as password, t.role as role from tblTeachers t
) foo where email = "[email protected]"
