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What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary.
Ans: View is a virtual table that does not consists of it own data it fetch the data from the original table.
Create view DEPT20 as select * from dept;
Where dno=20 group by dno;
Illustrate the statement 'Projection operation distributes over the union operation'. Give an example. Ans: Π L (E 1 ∪ E 2 ) = (Π L (E 1 )) ∪ (Π L (E 2 )) This says th
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growing phase and shrinking phase are disjoint, why ?
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A set of possible data values is called? A set of possible data values is called as domain.
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explain cascading rollback
What is a database? Database - Basically in simple terms A database is a collection of inter related data and/or information stored so which it is available to several users
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