Ungayisebenzisi ikhowudi ye-ZIP okanye inombolo yokhuseleko loluntu
Iinkcukacha zixhomekeke kwizihluthulelo zokugcina, ukuhlenga, nokuthelekisa okanye ukudala ubudlelwane phakathi kwamarekhodi. Ukuba uye wahlala ngeenkcukacha zexesha elithile, mhlawumbi uvile ngeentlobo ezahlukeneyo zitshixo: izitshixo eziphambili, izitshixo zabaviwa , kunye nezitshixo zangaphandle . Xa udala itafile yedatha entsha, uceliwe ukuba ukhethe ukhiye oyintloko oyintloko oza kubona ngokukodwa irekhodi nganye egcinwe kule tafile.
Kutheni kubalulekile ukuba luphambili
Ukukhethwa kweprayimari ebalulekileyo kuyona yezona zibalulekileyo zigqibo oza kuzenza ekwenzeni i -database entsha . Umqobo obaluleke kakhulu kukuba kufuneka uqinisekise ukuba ukhiye okhethiweyo uhlukile. Ukuba kunokwenzeka ukuba iirekhodi ezimbini-ezedlulileyo, ezikhoyo, okanye ezizayo-zingabelana ngesantya esifanayo kwi-attribute, lukhethi olukhethiweyo oluphambili.
Enye into ebalulekileyo yeprayimari ebalulekileyo yintsebenziswano yamanye amacwecwe adibanisa nayo kwi-database yolwazi. Kule ngongoma, izinto eziphambili eziphambili zijolise ekujoliswe kuyo. Ngenxa yezi mboleko, inqakrazo ephambili kufuneka ibe khona xa irekhodi lenziwe, kwaye alinakuze litshintshe.
Iinqununu ezikhethiweyo zeeKeyona eziPrayimari
Oko abanye abantu abanokuyicinga ukuba kukho ukhetho olubalulekileyo kwisisiseko esisisiseko kunokubakho ukhetho olubi kunoko. Nazi izibonelo ezimbalwa:
- Iikhowudi ze-ZIP azenzi izicwangciso eziphambili zetafile yeedolophu. Ukuba wenza itafile elula yokujonga iidolophu, ikhowudi ye-ZIP ibonakala ngathi iyinqobo ebalulekileyo engundoqo. Nangona kunjalo, xa uphando olongezelelweyo, unokwazi ukuba iidolophu ezingaphezu kweyodwa ziba nekhodi ye-ZIP. Ngokomzekelo, imizi yaseNew Jersey yaseNeptune, i-Neptune City, iTinton Falls, kunye neDolophu yaseWall yonke isabelo se-ZIP code 07753.
- Izinombolo zoKhuseleko loLuntu azenzi izicwangciso eziphambili eziphambili ngezizathu ezininzi. Uninzi lwabantu lucinga ukuba i-SSN yabo ibe yimfihlo kwaye ayifuni ukuba ibonakale ngokucacileyo kubasebenzisi beenkcukacha. Abanye abantu abanabangaphandle be-SSN okanye abafuduki abangazange bafumane ikhadi leKhuseleko loLuntu. I-SSN ingasetyenziswa kwakhona emva kokufa komntu. Umntu unokufumana i-SSN engaphezu kweyodwa kwixesha lokuphila xa ulawulo loKhuseleko loLuntu lukhupha inombolo entsha kwiimeko zobuqhetseba okanye ukwebiwa kwezazisi.
- Iilesi ze-imeyile nazo zikhethi zikhethiweyo eziphambili. Nangona bahlukile, banokutshintsha ixesha. Ngaphezu koko, akuyena wonke umntu unayo idilesi ye-imeyile.
Ukukhetha iCandelo eliPhambili eliPhambili
Ngoko, yintoni eyenza ikona ephambili ephambili? Kwiimeko ezininzi, uye kwi-database yakho kwinkxaso.
Isilungeleliso esilungileyo kwi-design design kukuba isebenzise i-key primary engundoqo. Inkqubo yolawulo lwengcaciso yakho ingenza ngokuqhelekileyo ivelisi ekhethekileyo engenalo intsingiselo ngaphandle kwenkqubo yeenkcukacha. Umzekelo, ungasebenzisa uhlobo lweenkcukacha zeMicrosoft Access AutoNumber ukudala inkundla ebizwa ngokuba yiRekhodi. Uhlobo lwedatha lwe-AutoNumber luyandisa ngokwengeziwe intsimi xa udala irekhodi. Ngoxa inani ngokwalo lingenanto, linika indlela ethembekileyo yokubhekisela kwirekhodi nganye kwimibandela.
Isixhobo esisisiseko esiqhelekileyo sisoloko sifutshane, sisebenzisa amanani, kwaye sigweme abalinganiswa abakhethekileyo okanye ukuxuba amanqaku aphezulu kunye nabancinci ukuze kuququzelelwe ukujonga ngokukhawuleza kwedatha kunye nokuthelekiswa.