Nge-Oracle SQL, sithola ikhono lokuthwebula isikhathi sokugcina sokungena somsebenzisi. Lokhu kungase kubonakale kuyimpahla eyigugu, ikakhulukazi uma kuziwa ekuphathweni kwesistimu, ukuthobelana, nokuphepha. Ngokugcina irekhodi okokugcina lapho umsebenzisi exhunywe kusistimu, umuntu angakwazi ukulandelela imisebenzi yabasebenzisi, ahlole izinkinga, noma aqinisekise ukusebenza okuphephile nokusebenza kahle.
I-Oracle SQL
Kuxazululiwe: hlola ukukhiya kwetafula
I-Oracle SQL iyithuluzi elinamandla kakhulu elivumela abasebenzisi ukuthi balawule futhi babuze idatha ngaphakathi kwesizindalwazi. Umsebenzi owodwa ovamile abahleli bezinhlelo abavame ukudinga ukuwenza ukuhlola ukukhiya kwetafula. Lokhu kuhlanganisa ukukhomba lapho into egciniwe, njengethebula, ikhiywa ngomsebenzi, ukuvimbela eminye imisebenzi ukuthi ingafinyeleli noma iyilungise. Uma ukukhiya kwethebula kwenzeka, kungaba nomthelela ekusebenzeni kwesistimu yakho yedatha, ngakho kubalulekile ukuxilonga ngempumelelo nokubhekana nakho.
Kuxazululiwe: ungayibheka kanjani yonke imisebenzi ehleliwe
Isingeniso
Ukuphatha imisebenzi ku-Oracle ngokuvamile kuwumsebenzi oyinkimbinkimbi, kodwa ubalulekile ekugcineni isizindalwazi esisebenza kahle nesithuthukisiwe. Ngokusebenzisa imisebenzi ehleliwe, abasebenzisi bangakwazi ukwenza imisebenzi evamile ngokuzenzakalelayo, baqinisekise ukusebenza kahle ngaphandle kwesidingo esiqhubekayo sokuqapha yonke inqubo mathupha. Lo mhlahlandlela uzokusiza ukuthi uhlole yonke imisebenzi ehleliwe, unikeze ukuhlukaniswa kwesinyathelo ngesinyathelo se-codework ebalulekile edingekayo.
Okuxazululiwe: qala umsebenzi
Umhlaba wemfashini wehlukene njengamakhodi akha amawebhusayithi nezinhlelo zokusebenza. Njengongcweti kukho kokubili ukuhlela ku-Oracle SQL nemfashini, ngimi endaweni efanele ukukusiza uqonde kangcono le mikhakha yomibili.
I-Oracle SQL iyizinga eliphezulu, ulimi olufana nesiNgisi olusebenzisa isethi yemiyalo elula, kodwa enamandla ukuze ilawule idatha kusizindalwazi esihlobene. Lokhu kufana nendlela imfashini esebenzisa ngayo izitayela ezahlukene, ukubukeka, namathrendi ukuze yakhe isethulo esikhangayo. Zombili izinkambu zidinga ukuqonda okujulile kokuthi izakhi ezihlukene zisebenza kanjani ndawonye ukuze kuzuzwe umphumela ofisa ukuwenza.
Kuxazululiwe: sql khetha ikota kusukela kudethi
Impela, ake ngifanekise:
I-Oracle SQL iwulimi lwedathabheyisi olunamandla olusetshenziswa kakhulu ekulawuleni nasekuhleleni idatha kusizindalwazi. Phakathi kokusebenza okuningi, esinye sezici ezihlaba umxhwele yikhono lokudlala nezinsuku ku-SQL. Into evame ukuvela isidingo sokuthola a ikota kusukela ngosuku. Lo msebenzi uqondile nge-Oracle SQL.
Ixazululiwe: umsebenzi we-lpad ku-sql
Endaweni ye-Oracle SQL, umsebenzi we-LPAD udlala indima ebalulekile ekulawuleni idatha. Izikhathi eziningi, sizithola sisesimweni lapho idatha esisebenza nayo ingenakho ukwakheka okufanayo. Lokhu kungaholela ekuphambeni nasezinkingeni ngenkathi ubuza noma uhlaziya idatha. Nakhu lapho umsebenzi we-LPAD usindisa khona usuku. Kuyithuluzi lokukhohlisa iyunithi yezinhlamvu elingakwazi ukupheda iyunithi yezinhlamvu ukusuka kwesokudla ukuze uqinisekise ukuthi wonke amaphuzu edatha anokufana.
Kuxazululiwe: yehlisa umkhawulo
Impela, nakhu okusalungiswa kokuqala kwe-athikili ephelele ye-'Drop Constraint in Oracle SQL'.
Ukwehlisa izithiyo kuthebula kusizindalwazi se-Oracle SQL kuyisici esizuzisa kakhulu konjiniyela. Lo msebenzi wenza ukuguqulwa kwesakhiwo setafula kube lula futhi kukhuphule ukusebenza kahle kolwazi olugciniwe. Ulimi lwe-SQL ngokwendabuko lusekela lesi sici, usebenzisa ukuthi, ungakwazi ukulahla izithiyo ngokushesha. Kufanele ubambe ilungelo elibalulekile le-DROP ANY TABLE ukuze igama lakho lomsebenzisi lenze lo msebenzi. Ukuqinisekisa ubuqotho besizindalwazi sakho, kubalulekile ukuthi ubuyekeze futhi ubuyekeze izithiyo ezihambisana nezidingo zohlelo lwakho lokusebenza.
Kuxazululiwe: shintsha iphasiwedi
Ukuqonda ubunkimbinkimbi bokuphathwa kwephasiwedi ye-Oracle SQL akubalulekile kuphela ekuphathweni kwesizindalwazi kodwa futhi kuyisici esibalulekile sokuphepha. I-Oracle SQL, ubuchwepheshe besizindalwazi obuhamba phambili obunenkundla eqinile nevikelekile, inikeza izindlela ezihlukahlukene zokushintsha noma ukusetha kabusha amaphasiwedi. Lesi sihloko sizocubungula inqubo yokushintsha iphasiwedi ye-Oracle SQL, sihlaziye inkinga, sinikeze izixazululo, futhi sinikeze ukuhlukaniswa kwesinyathelo ngesinyathelo samakhodi anikeziwe.
Kuxazululiwe: cisha umkhawulo
Njengonjiniyela we-OracleSQL, kuvamile ukuthi ngezikhathi ezithile, sidinga ukudala kabusha noma ukuvuselela izinto ezithile kusizindalwazi sethu. Izimo ziphakama lapho izithiyo Zokhiye Wangaphandle zingase zibe khona, futhi zimise ukuqhubeka komsebenzi. Kwesinye isikhathi, lezi zingqinamba zidinga ukumiswa okwesikhashana, noma "zicishwe", ukuze kuqhutshekwe. Yilapho ukuqonda ukuthi kukhubaza kanjani izithiyo ku-Oracle SQL kungabonakala kuwusizo, kusinikeze ukusebenza okuqhubekayo okushelelayo esikudingayo.