Data Modeling - Entity Instance (Row|Tuple|Member|Unit)

1 - About

An entity instance is a single occurrence of an entity.

In a database environment, an entity is commonly implemented by a table and an instance by a row. An orphan instance is one that does not have a corresponding existing parent record.

In a database model, the Primary Key identifies a single instance

Row means:

  • in Mathematics, a tuple.
  • in Statistics, a unit, an observation
  • in Olap, a member
  • In dynamic language, a struct or a class.
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data_modeling/instance.txt ยท Last modified: 2017/02/23 14:41 by gerardnico