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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.
courier company er-diagram
What are two special events? The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered v
what is natural join?
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
What is a view? How it is related to data independence? A view might be thought of as a virtual table, that is, a table that does not really exist in its own right but is inste
Data Fragmentation "Fragmentation includes decomposing the data in relation to non-overlapping component relations". Why do we require fragmenting a relation?
What is NULL? Simply NULL means not in value.
Give the Introduction of OBJECT DESIGN Strategies which are selected during system design are carried out in object-oriented design. In this procedure, objects which are identi
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Define Shared locks? Ans: Shared lock: Throughout concurrent execution of transactions, earlier than a transaction can access a data item, it has to obtain a lock on it. Now he
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