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A collection of a same kind of entities is known as an Entity Set or entity type.
Example:
For the COLLEGE database defines earlier objects of concern are Students, Faculty, Course and departments. The sets of all the students' entities form a entity set STUDENT. Likewise collection of all the courses creates an entity set COURSE.
Entity sets require not be disjoint. For example - an entity may be part of the entity set STUDENT, the entity set FACULTY, and the entity set PERSON.
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In how many parts events are classified Events are classified as four types in UML 1. Signals 2. Calls 3. Passing of Time 4. Change in State
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1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
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Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
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