Hello! Generally speaking, regarding performance, is "expensive" having 
calculated fields?
 Not complex ones, I mean this type of thing:
 

 ... COMPUTED BY (cast(qty * price * tax / 100 as money 2))
 

 So far I don't notice any difference but I'd like to hear opinions about 
whether is a good idea using them.
 

 
 Probably having a real field, maintained with a trigger is better? I don't 
like having redundant data in my database, but I'm note sure what is the better 
option: waste a bit of space or (probably) decrease performance??
 

 Thanks!!!!
 

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