@@ -30,7 +30,7 @@ main = do
31 --6. execute a relational algebra query
31 --6. execute a relational algebra query
32 let restrictionPredicate = AttributeEqualityPredicate "name" (NakedAtomExpr (TextAtom "Steve"))
32 let restrictionPredicate = AttributeEqualityPredicate "name" (NakedAtomExpr (TextAtom "Steve"))
33− eRel <- executeRelationalExpr sessionId conn (Restrict restrictionPredicate (RelationVariable "person"))
33+ eRel <- executeRelationalExpr sessionId conn (Restrict restrictionPredicate (RelationVariable "person" ()))
34 case eRel of
34 case eRel of
35 Left err -> putStrLn (show err)
35 Left err -> putStrLn (show err)
36 Right rel -> putStrLn (show $ showRelation rel)
36 Right rel -> putStrLn (show $ showRelation rel)