• From: Michael Kay <mike@s...>
• To: Rick Jelliffe <rjelliffe@a...>
• Date: Wed, 12 Apr 2017 08:27:16 +0100

> 
> For example, that your travel-agency application does not handle red-haired people. 
> 

And in practice, many integrity constraints are actually guards to prevent "edge cases" reaching the application when the application can't handle them.

Typical example: every bank branch must have a postal address. Meaning: sorry, this application can't handle the travelling bank-in-a-bus that we introduced to serve remote rural communities. You're just going to have to give the bus a dummy address, or things won't work.

Michael Kay
Saxonica

• References:
  • Implement data rules in application code?
    • From: "Costello, Roger L." <costello@m...>
  • Re: Implement data rules in application code?
    • From: Michael Kay <mike@s...>
  • Re: Implement data rules in application code?
    • From: Rick Jelliffe <rjelliffe@a...>
  • Re: Implement data rules in application code?
    • From: Rick Jelliffe <rjelliffe@a...>