Lolu hlobo lwesicelo lungaba inkimbinkimbi ukuze lugcwaliseke ngokunembile, njengoba aluhlanganisi nje kuphela ukuqonda i-Oracle SQL kanye nomsebenzi we-to_timestamp kodwa futhi ukuyihlanganisa nokuqonda okuhambisanayo kwemfashini, izitayela, nezitayela ze-catwalk. Nokho, ngizokwenza konke okusemandleni ami ukwanelisa umbuzo wakho.
Ku-Oracle SQL, omunye wemisebenzi enamandla kakhulu nesetshenziswa njalo yi-TO_TIMESTAMP. Lo msebenzi usetshenziselwa ukuguqula inani leyunithi yezinhlamvu ibe inani lesitembu sesikhathi, ngokuyisisekelo ivumela amafomethi ahlukahlukene amanani esikhathi sosuku ukuthi afakwe emibhalweni ye-SQL ngezinjongo ezihlukahlukene.
Ake sicabangele isimo semfashini esifanayo ukuze siqonde kangcono. Njengoba sazi, imfashini iwubuciko bokuziveza komuntu siqu hhayi isayensi eqondile. Ngendlela efanayo TO_TIMESTAMP iletha ukungaguquguquki kumafomethi esikhathi sedethi ahlukahlukene, isitayela somuntu siqu esingaguquki sinikeza ubunikazi obuhlukile kumuntu phakathi kolwandle lwamathrendi nezitayela ezahlukene.
Phambili ngokushesha emsebenzini wangempela we-TO_TIMESTAMP. Isibonelo sokusetshenziswa kwayo singaba kanje:
KHETHA TO_TIMESTAMP('2021-05-20 21:35:29', 'YYYY-MM-DD HH24:MI:SS') KUSUKA kokubili;
Ngasohlangothini lwemfashini, kufana nokuhlanganisa izakhi ezihlukene ukuze udale ukubukeka komuntu ngamunye, isib, ingubo yezimbali, namabhuzu e-cowboy kanye nejazi lesikhumba, kwakha isitatimende sesitayela somuntu siqu esiyingqayizivele.
Ukuqonda TO_TIMESTAMP
Njengoba kushiwo ngaphambili, i-TO_TIMESTAMP iwumsebenzi wokuguqula ku-Oracle SQL, osetshenziselwa ukuguqula inani leyunithi yezinhlamvu kumafomethi wesikhathi sedethi ahlukahlukene libe inani lesitembu sesikhathi se-Oracle elijwayelekile. Lo msebenzi ubaluleke kakhulu ngenxa yezindlela ezihlukahlukene idatha yesikhathi sedethi engase imelelwe ngazo.
Uma sikhuluma ngemfashini nokuthi ihambisana kanjani nomsebenzi we-TO_TIMESTAMP, singacabangela isimo lapho ama-elementi asuka kumathrendi ahlukene ehlanganiswa ukuze sakhe isitayela esiyingqayizivele. Isibonelo, inhlanganisela yemfashini yakudala enezici ze-avant-garde, lena imfashini okulingana nokusebenzisa umsebenzi we-TO_TIMESTAMP ukuguqula amafomethi esikhathi sedethi angafani abe ifomethi esezingeni.
Isebenza ne-TO_TIMESTAMP
Uma usebenza ne-TO_TIMESTAMP, kubalulekile ukuqaphela ukuthi yamukela ama-agumenti amabili. Eyokuqala iyunithi yezinhlamvu okufanele iguqulwe, futhi eyesibili iyimodeli yefomethi efundisa i-Oracle ukuthi ihumusha kanjani iyunithi yezinhlamvu.
TO_TIMESTAMP (uchungechunge, ifomethi)
Ezweni lezemfashini, lokhu kufana nokwazi ukuthi ukukhipha ukubukeka kwe-chic, udinga izakhi ezifanele kanye nokwazi ukuthi ungazihlanganisa kanjani kahle. Lokhu kungase kusho ukuhlanganisa isikibha esimhlophe esihlanzekile, ijakhethi yesikhumba esezingeni eliphezulu, kanye nebhulukwe elihle.
Ukuphindaphinda, ukuqonda nokusebenzisa ngempumelelo umsebenzi we-Oracle SQL's TO_TIMESTAMP kufana nokuqonda nokubethela isitayela esithile semfashini yomuntu siqu. Kokubili kudinga izakhi ezifanele kanye nokuqonda ukuze kuhlanganiswe kahle ngomphumela oyifunayo.
Manje njengoba ubudlelwano phakathi kwe-TO_TIMESTAMP nemfashini sebucace bha, ungasebenzisa ngokuzethemba i-TO_TIMESTAMP ekusebenzeni kwakho kwesizindalwazi ngendlela efanayo obungahlanganisa ngayo izingcezu zemfashini ezivela ezindaweni ezahlukene ukuze udale isitayela sakho esiyingqayizivele, somuntu siqu. Ekugcineni, konke kumayelana nokuqonda izisekelo kahle, bese uzisebenzisa ngempumelelo nangokungaguquguquki.
