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What is primary Key Explain?
Primary Key - Primary key is one of the candidate keys. It should be selected such in which its attribute values are never, or very rarely, changed.
What do you understand by a view? What does WITH CHECK OPTION clause for a view do? - A view is a virtual table which comprises fields from one or more real tables. - It is
With the help of a diagram defines the typical element modules of a DBMS? The functional elements of a database system can be widely divided into: 1) Storage manager and 2) q
What is Relational calculus? Relational calculus is a Non- Procedural language.
What is the use of group by clause? Group by clause is used to apply aggregate functions to a set of tuples. The attributes given in the group by clause are used to
Java program for horrizontal fragmentation in distributed database
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
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What are wait-for-graphs?Give the algorithm to construct a wait-for-graph from a given schedule of transactions? How can deadlocks be detected from wait-for-graphs? Ans: The
data models are being replaced over years. Reasons and why does that happen?
Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF. Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relati
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