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Posts: 39
6 days ago
What is an ID-Dependent entity? Include an example.
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Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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6 days ago
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There are some entities that cannot be completely identified without being associated with another entity that provides additional identifying information. A common example is an apartment, where just the apartment number by itself (for example, the number 12) does not tell you which apartment is being described–you have to know which building the apartment is in. Thus the entity APARTMENT needs to be associated with the entity BUILDING. In fact, the entity APARTMENT needs to include the identifier of BUILDING in the identifier of APARTMENT for the identifier of APARTMENT to be complete. An entity that requires the inclusion of another entity's identifier as part of its own composite identifier is called an ID-Dependent entity.
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wrote...
6 days ago
Thank you for answering so quickly
Woo
wrote...
6 days ago
Was feeling bored, my pleasure Grinning Face with Smiling Eyes
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