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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.
Spanned and unspanned organisation? Spanned and unspanned organization: If records are not permited to cross block boundaries then the organisation is called unspanned record
What is Disadvantages Of DBMS ? 1. Cost of Software and Hardware and Migration - A important disadvantage of the DBMS system is cost. 2. Reduced Response and Throughpu
What is the use of RAID? A variety of disk-organization methods, collectively called redundant arrays of independent disks are used to better the performance and reliability.
What is entity in DBMS? Entity: A DBMS entity is either a thing in the modelled world or a drawing element in an ERD.
What is 2NF? A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.
Determine the benefits of Object oriented design OOD also gives reusability, which saves time, costs and productivity gains through direct mapping to properties of Object-Orie
Types of Data fragmentation
various techniques of hashing?
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
HOW TO SOLVE THE LP Problems by simplex method?z=x1+-3x2+2x3
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