Thread: Custom Column for Identifiers, or combined with ISBN?
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Old 12-17-2014, 10:21 AM   #4
theducks
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Why bloat your DB (affects performance) using a custom column, with something that can be done with a filter or VL ?

From the Users guide
identifiers:=isbn: and identifiers:isbn:true will find books with a type equal to isbn having any value
identifiers:=isbn:false will find books with no type equal to isbn.
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