🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtРусскийالعربيةفارسی한국어中文日本語EntityQ934729· pop 27· linked from 75 articlesprimary keyAlso known as primary key constraintset of attributes (columns) that uniquely specify a tuple (row) in a relationAvailable in 27 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةAlbanianBahasa IndonesiaConnectionsrelational databaseEntitydatabaseEntityCategoriesDatabase management systemsData modeling