improved does_match by Brieuc

solution.pl

@@ -159,18 +159,27 @@ delete(Table, Conds) :-
     ).
 
 
-does_match([], _, Row) :- !.
+	does_match([], _, _) :- !.
 
-does_match([Cond|Rest], Table, Row) :-
+	does_match([Cond|Rest], Table, Row) :-
 		% Extract the operator, field and value from the condition
 		Cond =.. [Operator | T],
 		[+F, S] = T,
 	
+		% Get the columns of the table
 		tabl(Table, Cols),
+	
+		% Get the index of the field in the columns
 		member(F, Cols),
 		nth0(Index, Cols, F),
+	
+		% Get the value of the field in the row
 		nth0(Index, Row, Value),
+	
+		% Apply the operator to the value and the selector
 		apply(Operator, [Value, S]),
+	
+		% Check the next condition
 		does_match(Rest, Table, Row).
 
 :- dynamic selec/4.
@@ -229,8 +238,7 @@ selector(Row, Cols, [+Selector|Selectors], AccCols, AccVals, ColumnNames, Column
 		%go to next column tho evaluate
         selector(Row, Cols, Selectors, [Selector|AccCols], [Value|AccVals], ColumnNames, ColumnValue)
     ;   
-		string_concat(Selector, " isn't a column of table ", X),
-		string_concat(X, Table, Error),
+		string_concat(Selector, " isn't a column of table ", Error),
 		throw(Error)
     ).