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I've been looking for the solution for my problem in the forums but could'nt find what I need. I've read some posts where many of you answer that we should not try to store calculated values in tables but... Here what I'm trying to do. I've a table where I store some recurrent billings like...

Hi! Quick introduction... I'm portuguese and currently living near Lisbon (Queluz) but God nows for how long... I grew up in France near Paris. Why I'm telling you that? Because sooner or later you'll notice my english isn't so good... :) Anyway I'll do my best. My education is mainly...