Logical Data Modeling - Key

Data System Architecture


A key refers to a attribute, or a group of attributes, which assumes a unique value for:

A key is an identifier only for its local scope (ie inside a entity or relationship set). More … see Logical Data Modeling - Global Identifier (Fully Qualified Name, Canonical Form)




Data Type

An identifier data type must be able to hold any key value.

A common implementation of this data type is an integer (64 bit :))


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