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Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible?
Two relations R(A1, A2,-------, An) and S(B1, B2,-----, Bn) are said t union compatible if they have the similar degree n and if dom (A) = dom(B) for all i=1---ni i Intersection needs two relations to be union compatible since or else it is not probable to formulate the criterion as to on what basis will attributes be considered as general.
Explain the database Planning Project ?
What are the advantages and disadvantages of using a database system. Sol. Advantages of Database System (DBMS) : (1) Data Redundancy and Inconsistency: Since differen
Explain the steps for reduction of E-R model into relational model. Ans:(a) Entity set in E-R model will be considered as table name in relational Model. (b) Attributes of e
What are ways of finding out either an update is required or not for derived attributes? The ways to find out an update is required or, not are as: Explicit update
What is it ?
Benefits: It limits data access. It makes difficult queries look easy. It permits data independence. It presents dissimilar views of the similar data.
Define weak and strong entity sets? Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets. Strong entity set: Entity set that
a method named WonGame that checks each letter in the word is matched by its label
need requirement analysis for database management of stock market
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
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