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What is database Trigger?
A database trigger is a PL/SQL block that can explained to automatically execute for insert, update, and delete statements against a table. The trigger can e defined to execute once for the entire statement or once for each row that is inserted, updated, or deleted. For any one table, there are twelve events for which you can explain database triggers. A database trigger can call database procedures that are also written in PL/SQL.
prototype of a distributed information system for a national car part retail outlet chain.
what is union compatable?
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What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
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