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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.
waht is a repeating group?
Determine the Strong and Weak Entity Based on the method of foreign key, there might be arise a situation when we have to relate an entity having a primary key of its own and a
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What are the advantages of creating a table from existing table?
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Explain in details about the f unctions of DBA ?
Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
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