so thanks to all for the answers. But i'm going to be frustrated, no one of your solutions seems to work, and i can't understand why, because i've write another two functions that works well... I always obtain error: or unknown function (if i pass args without ' ') or "column not exist". i've noticed that on my postgres server, there's two database: one i've created for my scope, and another named postgres (i think created by default). Maybe should i specify on wich database my function should work (also if function compare only inside my personal database)?
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