Credit card APRs

  • The traditional way: CHAR(16) (no match needed)
  • CHAR, VARCHAR, and friends are very generic.
  • Customize your database to your business

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Data types as a class of object

 
  • Example type "date": has built-in attributes
  • Add in your own business logic (attributes)
  • Checks, domains, custom data types
  • Overload or write your own
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