All Books

  1. home
  2. Books
image description

MANAGING TIME IN RELATIONAL DATABASES

By: TOM JOHNSTON RANDALL WEIS

Over time, things change—things like customers, products, accounts, and so forth. But most of the data we keep about things describes what they are like currently, not what they used to be like. When things change, we update the data that describes them so that the description remains current. But all these things have a history, and many of them have a future as well, and often data about their past or about their future is also important.