In this chapter, we're going to discuss a feature that most SOL products have long
implemented but that was not standardized until the publication of SQL: 1999-
triggers. In fact, the specification for triggers was complete before SQL-92 was
published, but pressures to keep the size of SQL-92 from being even larger than it
was caused the deferral of several features.
The definition of triggers was among the deferred features, based on the
expectation that it would be several years before the feature would be widely
implemented by commercial products--an obvious error in judgment! In
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