🌐EnglishEnglishPortuguês한국어中文日本語EntityQ3489710· pop 7· linked from 5 articlesentity integritywhen 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 entityAvailable in 7 languages中文日本語PortuguêsCzechNorwegian한국어via Wikidata sitelinks · CC0Connectionsdata integrityEntityNULLEntityCategoriesData modelingData quality