December 2001
Intermediate to advanced
800 pages
17h 55m
English
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Chapter 8. Triggers
I'd rather be a “Has Been” than a “Never Was” any day of the week.
—H. W. Kenton
A trigger is a special type of stored procedure that executes when a specified DML operation (an INSERT, DELETE, or UPDATE, or any combination thereof) occurs. They're typically used to ensure that business rules are followed or to do other work when a data modification occurs. A trigger is the SQL equivalent of a 3GL callback function or a hooked interrupt vector.
You construct and attach triggers to tables using the CREATE TRIGGER command. When a table is dropped, so are its triggers.
Most of the details of stored procedure programming apply equally well to triggers. In fact, because you can call a stored procedure from a trigger, you can effectively ...
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