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.
Umsebenzi we-LPAD: Isixazululo
Ku-Oracle SQL, Umsebenzi we-LPAD usetshenziswa ngokuyisisekelo ukwengeza izinhlamvu ezithile ohlangothini lwesobunxele lweyunithi yezinhlamvu ize ifinyelele ubude obucacisiwe. Kuyindlela ewusizo yokuqinisekisa ukuthi idatha yakho igcina ukwakheka okuthile. I-syntax eyisisekelo yomsebenzi we-LPAD ku-Oracle SQL imi kanje:
I-LPAD ('string', ubude [, pad_text])
Lapha, 'iyunithi yezinhlamvu' iyunithi yezinhlamvu yomthombo edinga ukugxunyekwa. 'Ubude' ubude beyunithi yezinhlamvu yokugcina ngemva kokupheda, futhi 'i-pad_text' iyakhethwa futhi imele izinhlamvu ezizosetshenziselwa ukupheda. Uma i-'pad_text' inganikeziwe, umsebenzi usebenzisa izikhala ezizodwa njengohlamvu lwephedi oluzenzakalelayo.
Ukujula ngokujulile: Incazelo Yekhodi
Ukuze uqonde kangcono umsebenzi we-LPAD, ake sicabangele isibonelo. Ake sithi sinetafula eliqanjwe 'Imfashini', elinamakholomu 'I-ArticleId', 'Incazelo', kanye 'Nentengo'. Kudingeka siqinisekise ukuthi inkambu ye-ArticleId ihlala iqukethe izinhlamvu eziyi-10 zokufana.
Nali isethi yedatha yesampula:
| I-ArticleId | Incazelo | Intengo |
|———–|——————————-|
| ABC1 | Ijakhethi yedenim | 120 |
| DEF22 | Amabhuzu Esikhumba | 200 |
Kuthebula elingenhla, inkambu ye-ArticleId inobude obuhlukile bemigqa ehlukene. Ukuzijwayeza zibe ubude obuyi-10, singasebenzisa umsebenzi we-LPAD kanje:
KHETHA I-LPAD(I-ArticleId, 10, '0') NJENGOBA I-PaddedArticleId, Incazelo, Intengo EVELA Kumfashini;
Imigqa ewumphumela ingaba ne-'PaddedArticleId' efana ne-'000000ABC1' kanye ne-'00000DEF22'.
Imitapo yolwazi yomsebenzi nokuhluka
I-Oracle SQL inikezela ngomtapo wolwazi ocebile wemisebenzi eyakhelwe ngaphakathi njenge-LPAD yokusingatha imisebenzi ehlukahlukene yokukhohlisa idatha. Ezinye zazo zihlanganisa i-RPAD (efana ne-LPAD kodwa amaphedi kwesokudla sentambo), i-TRIM (isusa isikhala esimhlophe esiholayo nesilandelanayo), kanye no-LENGTH (okusetshenziselwa ukuthola ubude beyunithi yezinhlamvu).
Kunokuhlukahluka okuningi nezandiso ezingenzeka ngemisebenzi enjalo, futhi kukhulisa kakhulu ukukhululeka nokusebenza kahle kweyunithi yezinhlamvu ku-Oracle SQL.
Kuwo wonke umhlaba we-Oracle SQL, umsebenzi we-LPAD uyithuluzi elinamandla lokufometha kwedatha okungaguquki. Iqinisekisa ukufana, ngaleyo ndlela ithuthukise amakhono okubuza nokuhlaziya idatha. Kuyisixazululo esiphelele sokukhohlisa izintambo, ukufana kwedatha, nokwenza lula umsebenzi.
Ukungabikho komsebenzi we-LPAD Kwezinye Izilimi
Ngenkathi i-LPAD isebenziseka kakhulu ku-Oracle SQL, ezinye izilimi ezinjengePython neJava ngeshwa azinawo umsebenzi ofanayo owakhelwe ngaphakathi. Noma kunjalo, ukusebenza okufanayo kungafezwa kusetshenziswa inhlanganisela yeminye imisebenzi nemiyalo ehlukile kwezinye izilimi. Isibonelo, i-Python isebenzisa umsebenzi we-str.ljust(), kanti i-Java isebenzisa i-String.format() emisebenzini enjalo.
Kulolu hambo lwe-Oracle SQL nokusebenza kwayo, siqale ukuhlola ngokujulile umsebenzi we-LPAD, sagqamisa ukusetshenziswa kwawo, futhi sanikeza izincazelo zesinyathelo nesinyathelo ngokusetshenziswa kwawo. Lo msebenzi ngokungangabazeki umi njengengxenye ye-quintessence yokufometha idatha ku-Oracle SQL.
