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What is multiplicity in the associations? Give an example to explain multiplicity?
Multiplicity in association indicate number of objects participate in any relationship. For instance in association given in Figure you can see that one player can play for only one team at a time so here multiplicity is 1.
Explain the components of Database System in details.
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
Most computer systems authenticate users by asking them for the user name and password. However, the user names and passwords often can be guessed by hackers. Suggest an automated,
explain participation constraints with examples
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
Explain the three data models namely relational, network and hierarchical and evaluate their relative advantages and disadvantages. Hierarchical Model: In hierarchical model, da
what is union compatable?
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