January 2008
Intermediate to advanced
384 pages
8h 1m
English
Content preview from Joe Celko's Thinking in Sets: Auxiliary, Temporal, and Virtual Tables in SQL
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Chapter 9. Temporal Tables
SQL IS THE first programming language to have temporal data types in it. If COBOL had done this, we would never have had the “Y2K Crisis” in IT. However, each SQL product has its own version of temporal data types and functions, in spite of ANSI/ISO Standards. In 2007, the United States decided to change when Daylight Saving Time (DST) would start. The result was a “mini-crisis” because the Windows operating system had the old rule built into it and not everyone made the switchover. In Standard SQL, the entire schema is supposed to be on Universal Coordinated Time (UTC) and then converted to local lawful time—that means time zones and DST conversions for display purposes.
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