EntityQ3489710· pop 7· linked from 5 articlesentity integritySign in to savewhen each row in a table has a primary key that is unique and not null, so that each row represents a single instance of the modelled entityConnectionsdata integrityEntityNULLEntitydatabaseEntityQ47607EntitycolumnEntityprimary keyEntitydatabase tableEntityforeign keyEntityattributeEntityrowEntityreferential integrityEntityrelationEntityCategoriesData modelingData quality