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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;
What is serialization? Where it is used and why? Serialization is a basic term used for mechanisms which enable objects and object structures to be converted into portable for
Replicating Data One approach that may support efficient access to dissimilar applications as above may be to give access to every of the applications from dissimilar replicate
what is Nested relational model? Explain with examples.
Process of Adjustment of inheritance During object design, inheritance is readjusted by rearranging classes and operations, and abstracting common behaviour.
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
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Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
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Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
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