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What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification: The practice emplo
Differentiate between horizontal & mixed horizontal fragmentation?
Question: Consider the following database relations for a textbook ordering system used by a college bookshop: Book (b-copy#, bname, ISBN#, author, price, subject) Order (s#
what is stracture of dabms
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
Define what Immediate database modification technique uses? Ans: Both undo and redo.
Identify the need and use of data control through problem solving, illustration
What is Management System? A management system is a set of rules and process which help us to create organize and manipulate the database. It also helps us to add, change delet
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:
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