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What are referential integrity constraints?
A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another relation.
Explain the function of Object model Object model describes the classes of objects in system, including their attributes and operations which they support. The analysis object
explain various steps uses in evaluation and maintenance of MIS.
Explain the two constraints, check and foreign key in SQL along with an example for each. Give the syntax. CHECK constraint - CHECK constraint specifies an expression which
Question 1: (a) Planning and management of ICT projects have a very poor record in developing countries. Briefly explain five critical success factors for correct implementa
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
What do you mean by atomicity and aggregation? Atomicity : Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete trans
a method named WonGame that checks each letter in the word is matched by its label
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Differentiate between join and outer join? Outer joins return all rows from at least one of the tables or views mentioned within the FROM clause, as long as those rows get toge
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