{"version":"1.0","type":"link","title":"Entity integrity - Newikis","description":"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…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}