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 SQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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2.6. The Mindset Has Not Changed
Everyone is aware of the changes in hardware simply because they can see it is consumer goods. But people still try to “squeeze the bits” in their systems. A common application you will see posted on newsgroups is a recurrent relationship of some kind. The most common are probably temporal events, like scheduled meetings (”Every Friday at 14:00 Hrs”, “First of each month”, “The 15th of each month,” etc.), which we will discuss in Chapter 9.
The user will try to program the formula for these events and values into one or more columns in the table itself. In the case of the temporal functions, this has to be highly proprietary, but other functions are not easy either. There are two common kludges for this approach: ...
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