diff --git a/Scripts/DataBaseQueries/db_creation.sql b/Scripts/DataBaseQueries/db_creation.sql
index 6675653..a25d702 100644
--- a/Scripts/DataBaseQueries/db_creation.sql
+++ b/Scripts/DataBaseQueries/db_creation.sql
@@ -51,7 +51,7 @@ CREATE TABLE IF NOT EXISTS RDFs (
     SubjectID INTEGER NOT NULL,
     RelationshipID INTEGER NOT NULL,
     ObjectID INTEGER NOT NULL,
-    UNIQUE(SubjectID, RelationshipID, ObjectID),
+    UNIQUE(MovieID, SubjectID, RelationshipID, ObjectID),
     FOREIGN KEY(MovieID) REFERENCES Movies(MovieID),
     FOREIGN KEY(SubjectID) REFERENCES Subjects(SubjectID),
     FOREIGN KEY(RelationshipID) REFERENCES Relationships(RelationshipID),