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Category:	Technology
Word Count:	563
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	Contribution of CASE Tools to the System Development (by Richarg Ngu)
	By Richard Ngu The entity is the basic construct of data modeling. An entity instance is one occurrence of an entity. Entities are described by attributes that hold data about entity instances. Attributes have domains that define the legal set of data values for the attributes. One or more attributes in every entity are used to uniquely identify each instance of the entity, which is known as a key. The instances of an entity may be divided into subsets based on the value of subsetting criter

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Contribution of CASE Tools to the System Development (by Richarg Ngu)