COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Person or place.
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Association between the instances
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Named Property or characteristic
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Person, Place, Object, event or concept about which the data is to be maintained
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Detailed explanation-1: -ENTITY: A person, place, object, event, or concept about which the organization wishes to maintain data. Must need to store data.
Detailed explanation-2: -An entity represents a specific object (such as a specific customer or order). Each entity must have a unique entity key within an entity set. An entity set is a collection of instances of a specific entity type. Entity sets (and association sets) are logically grouped in an entity container.
Detailed explanation-3: -2) In relation to a database, an entity is a single person, place, or thing about which data can be stored. 3) In data modeling (a first step in the creation of a database), an entity is some unit of data that can be classified and have stated relationships to other entities.
Detailed explanation-4: -An entity is a person, place, object, event, or concept in the user environment about which the organization wishes to maintain data.
Detailed explanation-5: -Unary relationship: Association is maintained within a single entity. Recursive relationship: Relationship exists between occurrences of the same entity set. Binary relationship: Two entities are associated.