Subject Foreign Key
Author Nico Callewaert

I have a Customer table, and normally I could define 6 foreign keys to that
table : Country, language, coin, payment conditions.... Those fields are
referencing fields in other tables. Should I define those 6 foreign keys ?
Or could I have a performance problem after that ??
Is foreign keys a good thing to use ?

Many thanks,

Nico Callewaert