Assertion: entity integrity | /r/HasProperty | an integrity rule
Facets:
Source sentences:
text: Entity integrity is an integrity rule which states that every table must have a primary key and that the column or columns chosen to be the primary key should be unique and not null.
text: Entity integrity is an integrity rule which states that every table must have a primary key and that the column or columns chosen to be the primary key should be unique and not null.