Entity integrity
id:
entity-integrity-289-9247109
title:
Entity integrity
text:
Entity integrity is concerned with ensuring that each row of a table has a unique and non-null primary key value; this is the same as saying that each row in a table represents a single instance of the entity type modelled by the table. A requirement of E. F. Codd in his seminal paper is that a primary key of an entity, or any part of it, can never take a null value.
The relational model states that every relation must have an identifier, called the primary key, in such a way that every row of t
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Entity_integrity
date created:
date modified:
2023-03-26T22:45:38Z
main entity:
{"identifier":"Q3489710","url":"https://www.wikidata.org/entity/Q3489710"}
image:
fields total:
13
integrity:
13