I-Oracle SQL, isizindalwazi esinamandla sokuphatha kanye nolimi lokuhlela, lusetshenziswa kabanzi ezinhlanganweni ezahlukahlukene ukwenza imisebenzi yekhompyutha eyinkimbinkimbi. Ukuphathwa kwedatha kuba lula futhi kube lula ezinkampanini ze-IT nezinhlangano zebhizinisi. Le ndatshana ingena endaweni ye-Oracle SQL, iletha ngokukhethekile inqubo yokuvula idatha yomsebenzisi, ebalulekile ekubhekeni kokuphepha nokuphathwa kwedatha. Incazelo eningilizayo, yesinyathelo nesinyathelo izocaciswa ukuze kuhlinzekwe ngokuqondiswa komfundi.
Ukuvula Abasebenzisi ku-Oracle SQL
Ezimweni ezithile, i-akhawunti yomsebenzisi ku-Oracle SQL ingase ikhiywe ngenxa yemizamo ephindaphindiwe yokuhluleka yokungena ngemvume noma amapharamitha okuphepha asethwe umlawuli. Ngakho-ke, kubaluleke kakhulu ukuvula umsebenzisi ukuze kuqinisekiswe ukusebenza okungenazihibe kwamasistimu nokusebenza.
I-Oracle SQL inikeza i-syntax enekhono yokuvula ama-akhawunti omsebenzisi. Nakhu:
ALTER UMSEBENZISI WOKUVULA I-AKHAWUNTI;
The ALTER USER i-syntax ivumela abaphathi besizindalwazi ukuthi baguqule izici zomsebenzisi wesizindalwazi njengokuvula i-akhawunti yomsebenzisi.
Incazelo Yesinyathelo Nesinyathelo Yekhodi
Lapho kusetshenziswa umugqa ongenhla wekhodi, i-Oracle ishintsha isimo se-akhawunti somsebenzisi ukuze sivulwe. Nansi i-dissection elandelanayo yalokho okwenziwa ingxenye ngayinye:
- ALTER USER: Lona umyalo we-DDL(Data Definition Language) ku-Oracle SQL ovumela ukulungisa izakhiwo zomsebenzisi.
- igama lomsebenzisi: Leli igama le-akhawunti yomsebenzisi edinga ukuvulwa. Lokhu kufanele kuthathelwe indawo igama lomsebenzisi langempela kumyalo.
- VULA I-AKHAWUNTI: Lo musho uyalela u-Oracle ukuthi avule i-akhawunti yomsebenzisi eshiwo.
Qaphela ukuthi abasebenzisi abanelungelo lesistimu ye-'ALTER USER' kuphela abangakwazi ukwenza lo myalo.
Ukuqonda Imitapo yolwazi kanye nemisebenzi ehilelekile
I-Oracle SQL iyinkundla enkulu eyakhiwe imisebenzi eminingi nemitapo yolwazi esiza ukuphathwa kwedathabhesi. Enqubweni yokuvula umsebenzisi, isebenzisa ukusebenza okusuka ku-DDL (Ulimi Lwencazelo Yedatha).
Umyalo we-ALTER USER osuka ku-DDL uvumela ukwenza izinguquko ezimpahleni zomsebenzisi. I-DDL iyisethi engaphansi yemiyalo ye-SQL futhi ihlanganisa neminye imiyalo efana ne-CREATE, DELETE, ne-MODIFY yokwenza izinguquko zesakhiwo ohlelweni lokugcinwa kwedatha.
Sengiphetha, ukuvula umsebenzisi kusizindalwazi se-Oracle kuwumsebenzi olula futhi oqondile uma kwenziwa ngokufinyelela okulungile namalungelo. Ukuqonda kahle i-syntax yomyalo kuzoqinisekisa ukwenziwa ngempumelelo kwekhodi ukuze kuvulwe umsebenzisi. I-Oracle SQL, nemisebenzi yayo eklanywe kusengaphambili nemitapo yolwazi, yenza umsebenzi ube lula ngemigqa yamakhodi emincane.
