N-to-N implementation

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Hi all,
 
I'd like to set up a discussion (if necessary) about two different ways to implement N-to-N relationships: using a N-to-N intermediary table or, suppose an A and B tables situation, creating the primary key of the table B with the A.id plus a sequencer.
 
I'm thinking on going the second way, but decided to ask the list if anybody sees any potencial problem in it, like for performance or anything.
 
Filipe Knoedt

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