Apololgies, Gmail's web interface and I am not always friends. The above message was sent before I have finished it.
Users can also build dynamic query (as long as all the tables are presented in the original query) using the search function (query-button) that comes with the grid. My experience is that users do not find that function very easy to use, so you might have to provide them with some guidelines and/or examples. Regards Johann -- Because experiencing your loyal love is better than life itself, my lips will praise you. (Psalm 63:3)