diff --git a/src/dbdrivers/postgresql/z_db.erl b/src/dbdrivers/postgresql/z_db.erl
index 72e20a853d..30354c3320 100644
--- a/src/dbdrivers/postgresql/z_db.erl
+++ b/src/dbdrivers/postgresql/z_db.erl
@@ -48,6 +48,7 @@
     delete/3,
     select/3,
     columns/2,
+    column_names/2,
     update_sequence/3,
     table_exists/2,
     
@@ -383,6 +384,11 @@ columns(Table, Context) ->
             Cols
     end.
 
+%% @doc Return a list with the column names of a table.  The names are sorted.
+%% @spec column_names(Table, Context) -> [ atom, ... ]
+column_names(Table, Context) ->
+    lists:sort(proplists:get_keys(columns(Table, Context))).
+
 
 %% @doc Update the sequence of the ids in the table. They will be renumbered according to their position in the id list.
 %% @spec update_sequence(Table, IdList, Context) -> void()