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PostgreSQL Development Essentials
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A trigger is a specification that the database should run automatically whenever a certain type of operation is performed. It can be defined to run or fire either before or after any INSERT, UPDATE, or DELETE operation is performed on a particular object. This operation can be associated with a table, a view, a schema, or the database, and it is one of the following:
DELETE, INSERT, or UPDATECREATE, ALTER, or DROPSERVERERROR, LOGON, LOGOFF, STARTUP, or SHUTDOWNLike a stored procedure, a trigger can be invoked repeatedly. A procedure is explicitly run by a user or an application but triggers are implicitly fired when a triggering event occurs, no matter which user is connected or which application is used. It can be enabled and disabled but you cannot explicitly invoke it. While a trigger is enabled, the database automatically invokes...
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