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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;
Explain nested relations? Nested relations The assumption of INF is a natural one in the bank examples we have considered. However, not all applications are best modelled
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I want to buy this but I want to see a couple sample questions first. http://www.expertsmind.com/library/what-happens-to-rms-error-for-the-training-data-set-51564843.aspx
A student entity type has the following attributes,name..
explain participation constraints with examples
I want an iPad app that is a simple 1 page form to complete with text. The Objective is to allow a few dozen people of the same organization (they're all on iPad) to open the app,
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difference between internal schema and external schema in DBMS
Consider the subsequent relations for a database which keeps track of business trips of salespersons in a sales office: SALESPERSON (SSN, Name, start_year, Dept_no) TRIP (SSN, Fr
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