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What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
What are the Objectives of object design After going through this unit, you could be able to: explain steps of object design; discuss algorithms that reduce costs;
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Server Control It is usual to control access to the data via the front end application, for example by displaying data as ‘read only'. This part of the assignment illustrates ho
Explain ER Relationship model? An entity-relationship model (ERM): An entity-relationship model (ERM) is an abstract theoretical illustration of structured data. Entity-relatio
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
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