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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Chapter 10. Valued Predicates
VALUED PREDICATES IS MY term for a set of related unary Boolean predicates that test for the logical value or NULL value of their operands. IS NULL has always been part of SQL, but the logical IS predicate was new to SQL-92, and is not well implemented at this time.
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