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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 a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
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An entity set that does not have sufficient attributes to form a primary key is called? An entity set that doesn't have sufficient attribute to form a primary key is known as w
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My cut off date is very soon in a Database subject and i dont know how to solve anything in it
#question.what is mapping constraints and types?.
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