search for: represrented

...A and a Type D; a Type C, D, E; just a Type F; etc. Having a join table would seem like it might get rather expensive since I''m going to want to know the types each time I call an entry. Seemed an obvious way would be to use an integer and bitwise ops, so that each bit in the integer represrented a type which could be on or off. Does anyone have any comments re the wisdom or otherwise of doing this? Would the benefits be outweighed by the calculation overhead? Any better way that I haven''t thought of? Cheers in advance Chris T (p.s. I''m using MySQL at the moment) --...