A superkey chiyeuchidzo chinogona kushandiswa kutarisa rekodhi re database
A superkey ingangodaro imwe chete kana kusanganiswa kwezvinhu zvinogona kushandiswa kunyanya kuziva rekodhi re database. Tafura inogona kuva nekubatana kwakawanda kunogadzira superkeys.
Superkey Example
Tafura ine minda
Zita | Age | SSN | Phone Phone. |
---|---|---|---|
Robert Jones | 43 | 123-45-6789 | 123 |
Beth Smith | 43 | 234-56-7890 | 456 |
Robert Jones | 18 | 345-67-8901 | 789 |
Sezvaunogona kuona, mapuranga e
Aina dze Superkeys
Pakati peavo vakarongerwa mu tafura iri pamusoro, chete
Iko
Kana tafura yacho isina "SSN> korona uye mushandirwi anogona kuumba nhamba dzevaranda kuitira kuti awane vanhu.
Nhamba idzodzo dzevashandi dzaizotumidzwa kuti "keyrogate key key". Ichi chinokosha chinonyanya kukosha chinogonawo kushanda sechikwata.