Amagama Agodliwe Nge-Sql
Njengomholi wezobuchwepheshe ongumakadebona onothando lokuqamba izinto ezintsha, ngibe nelungelo lokusebenza namaqembu ahlukahlukene ukuthuthukisa izixazululo ezisezingeni eliphezulu eziguqula amabhizinisi. Enye indawo ebilokhu ingihlaba umxhwele indawo ye Amagama Agodliwe Nge-Sql. Kulokhu okuthunyelwe kwebhulogi, ngizongena emhlabeni we Amagama Agodliwe Nge-Sql, ukuhlola ukubaluleka kwayo, isimo somhlaba wangempela, kanye nemininingwane engenzeka ukuze ikusize uzulazule kulesi sihloko esiyinkimbinkimbi.
Ngakho, ziyini ngempela Amagama Agodliwe Nge-Sql? Ngamagama alula, Amagama Agodliwe Nge-Sql amagama angukhiye olimini lokuhlela anencazelo ethile futhi angeke asetshenziswe njengezihlonzi ezifana namagama aguquguqukayo noma imisebenzi ngaphandle kokucaphuna okufanele noma ukubaleka. Lawa magama abekelwe ulimi ngokwalo, futhi ukuwasebenzisa njengezihlonzi kungaholela kumaphutha, ukudideka, ngisho nokuba sengozini kwezokuvikela. Embhalweni we-Sql, Amagama Agodliwe Nge-Sql ziyingxenye ebalulekile yokwakhiwa nokuthuthukiswa kwesizindalwazi.
Kungani kunendaba? Awu, Amagama Agodliwe Nge-Sql ingenza noma iphule i-schema sakho sesizindalwazi. Uma unganakile, ungase ugcine usune-schema esigcwele amaphutha, okwenza kube nzima ukunakekela, ukubuyekeza, noma ukubuza idatha yakho. Esimeni somhlaba wangempela, ngikhumbula ngisebenza nethimba elalakha isizindalwazi seqoqo elikhulu lezitolo. Babesebenzisa Amagama Agodliwe Nge-Sql njengezihlonzi, okuholele ezinkingeni eziningi, okuhlanganisa ukonakala kwedatha nemiphumela engahambisani. Kwakuyiphupho elibi ukulungisa iphutha nokuxazulula.
Isimo Somhlaba Wangempela: Ukuguqula Amagama Agodliwe Nge-Sql Yempumelelo
Ake sicabangele isibonelo sokucatshangelwa seSears Hometown & Outlet Stores, uchungechunge lwezitolo olunenethiwekhi enkulu yezitolo kulo lonke elase-United States. Babefuna ukuthuthukisa isizindalwazi ukuze baphathe i-inventory yabo, idatha yekhasimende, nolwazi lokuthengisa. Kodwa-ke, i-schema yabo yedathabheyisi yayigcwele Amagama Agodliwe Nge-Sql, okwenza kube nzima ukubuza nokuhlaziya idatha yabo. Nasi isimo sokucatshangelwa:
- I-schema yesizindalwazi sabo sasihlanganisa ithebula elibizwa ngokuthi “KHETHA,” elalisetshenziswa ukugcina umlando wokuthenga kwamakhasimende. Nokho, leli gama lethebula futhi bekuyi-Reserved Word In Sql, okubangela amaphutha uma ubuza idatha.
- I-schema yabo yesizindalwazi iphinde yafaka ikholomu ebizwa ngokuthi “FROM,” eyasetshenziswa ukugcina umthombo womkhiqizo. Nokho, leli gama lekholomu beliphinde libe yi-Reserved Word In Sql, okubangela amaphutha lapho kubuyekezwa idatha.
- I-schema yesizindalwazi sabo sasihlanganisa ukubuka okunegama elithi “LAPHO,” okwasetshenziswa ukuhlunga idatha yekhasimende. Nokho, leli gama lokubuka beliphinde libe yi-Reserved Word In Sql, elidala amaphutha uma ubuza idatha.
Njengoba ungabona, Amagama Agodliwe Nge-Sql kungabangela inqwaba yezinkinga ku-schema sedathabhesi. Ukuxazulula lokhu, kwakudingeka siguqule i-schema ukuze sigweme ukusebenzisa Amagama Agodliwe Nge-Sql njengezihlonzi. Siqambe kabusha ithebula, ikholomu, namagama wokubuka ukuze sigweme ukungqubuzana nawo Amagama Agodliwe Nge-Sql. Lokhu akuxazululanga amaphutha kuphela kodwa kuphinde kwathuthukisa ukugcinwa kanye nokusebenza kwesizindalwazi.
Ngakho, ungakugwema kanjani Amagama Agodliwe Nge-Sql ku-schema sakho sesizindalwazi? Nansi eminye imininingwane engasebenza:
Sebenzisa isimiso sokuqamba esigwemayo Amagama Agodliwe Nge-Sql. Isibonelo, sebenzisa isiqalo noma isijobelelo ukuze uhlukanise izihlonzi zakho kuzo Amagama Agodliwe Nge-Sql.
Sebenzisa ukucaphuna noma ukweqa ukuze usebenzise Amagama Agodliwe Nge-Sql njengezihlonzi. Nokho, qaphela, njengoba lokhu kungaholela emaphutheni nokuba sengcupheni kwezokuvikela.
3. Sebenzisa ithuluzi lokuklama isizindalwazi noma uhlaka olukusiza ukuthi ugweme Amagama Agodliwe Nge-Sql. Amathuluzi amaningi esimanje wokuklama isizindalwazi kanye nezinhlaka zinikeza izici zokuhlonza nokuvimbela Amagama Agodliwe Nge-Sql ukusetshenziswa.
4. Hlola i-schema sesizindalwazi sakho kahle ukuze uqinisekise lokho Amagama Agodliwe Nge-Sql azibangeli amaphutha noma izingxabano.
Ngokulandela le mininingwane, ungagwema izingibe ze Amagama Agodliwe Nge-Sql futhi yakhe i-schema yedatha eqinile, elondolozekayo, futhi enwebekayo.
Mayelana Nombhali
Ngingu-Lily, umholi wezobuchwepheshe ophumelele onothando lokuqamba izinto ezintsha nokuxazulula izinkinga. Ngaphezulu kweminyaka engu-9 yesipiliyoni ku-AI namarobhothi, ngithuthukise ukuqonda okujulile kwamandla we Amagama Agodliwe Nge-Sql. Futhi ngingumbhali oshisekayo, futhi ngiyakujabulela ukwabelana ngolwazi lwami nemininingwane nabanye. Uma ngingasebenzi, ungangithola ngihlola intuthuko yakamuva kwezobuchwepheshe noma ngihamba ngezinyawo ezintabeni ezinhle ze-Nevada. Ngiyaziqhenya ngokuba yingxenye yethimba le-State Farm, lapho ngithole ithuba lokusebenza kumaphrojekthi ahlukahlukene, okuhlanganisa iphrojekthi Amagama Agodliwe Nge-Sql ngezinsuku zami zasenyuvesi. Ngijabule ukwabelana nawe ngobuchule bami futhi ngikusize uzulazule emhlabeni oyinkimbinkimbi Amagama Agodliwe Nge-Sql.
Umusho wokuzihlangula: Ulwazi oluhlinzekwe kulokhu okuthunyelwe kwebhulogi ngelezinjongo zokufundisa kuphela futhi akufanele luthathwe njengeseluleko sochwepheshe. Isibonelo sokucatshangelwa esisetshenziswe kulokhu okuthunyelwe ngesezinjongo zemifanekiso kuphela futhi asibonisi noma yisiphi isimo somhlaba wangempela. Amagama Agodliwe Nge-Sql ingaba yinkimbinkimbi futhi ihluke, futhi kubalulekile ukubonisana nochwepheshe abaqeqeshiwe ngaphambi kokwenza noma yiziphi izinqumo ezihlobene nokwakhiwa nokuthuthukiswa kwesizindalwazi.
