July 2010
Intermediate to advanced
840 pages
16h 33m
English
Content preview from Joe Celko's SQL for Smarties, 3rd Edition
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12.2. Results with NULL Values and Empty Strings
As you would expect, a NULL in the predicate returns an UNKNOWN result. The NULL can be the escape character, pattern, or match value.
If M and P are both character strings of length zero, M LIKE P defaults to TRUE. If one or both are longer than zero characters, you use the regular rules to test the predicate.
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