Swift 4: Using Core Data - NSSortDescriptor and NSPredicate
When conducting an NS Fetch Request, you most likely do not want every record in your database, but a subset of the date. NSPredicate allows you to select a subset of your data, which is returned as an Array by NSFetchRequest, and thus can be ordered, with an NSSortDescriptor.
Multiple NSSortDestriptors can be supplied to sort date in multiple columnts, such as age, followed by gender, followed by name.
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