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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.
1. Determine that the Checkpoints are a part of Ans: Checkpoints are a part of Recovery measures
composite attribute
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Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
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