Ixazululiwe: intambo ehlukanisiwe

Lapho usebenza nezizindalwazi, umsebenzi ojwayelekile ukukhohlisa nokuhlaziya idatha ukuze uthole imininingwane ewusizo. Izikhathi eziningi, lokhu kuhilela ukubhekana nezintambo, ikakhulukazi ukuzihlukanisa ngokusekelwe kuma-delimiter athile. Ku-Oracle SQL, kunezindlela ezihlukahlukene zokufeza lokhu ngokusebenzisa imisebenzi ehlukene namakhodi enqubo. Kulesi sihloko, sizofaka isisombululo esibanzi sokuhlukanisa iyunithi yezinhlamvu usebenzisa i-Oracle SQL. Sizoxoxa ngomqondo, isisombululo, futhi sihlukanise ikhodi ngesinyathelo ngesinyathelo ukuze siqonde kangcono.

Ukuhlukanisa Izintambo ku-Oracle SQL

Ku-Oracle SQL, ukuhlukaniswa kwentambo kungenziwa ngokusebenzisa ulimi lwe-PL/SQL noma ngemibuzo ye-SQL elayishwe imisebenzi eyakhelwe ngaphakathi noma ama-opharetha akhethekile. Kodwa indlela evame ukusetshenziswa kakhulu ukukhulisa ukusebenza kwemvelo kwe- REGEXP_SUBSTR function, emele i-Regular Expression Substrings. Inikeza indlela enembile nephumelelayo yokubhekana nezintambo. Ngokuhambisana nalokhu, iphinde ivumele ukusetshenziswa kwezengezo ezijwayelekile ukuze kucaciswe amaphethini aqondile okufanele uwabheke kuyunithi yezinhlamvu.

Isixazululo: Ukusebenzisa umsebenzi we-REGEXP_SUBSTR

Memezela
str VARCHAR2(100):= 'I-Oracle,SQL,String,Split';
i-reslt VARCHAR2(100);
QALA
FOR i IN 1..LENGTH(str)-UBUDE(REPLACE(str,',',”))+1
PHAMBILI
reslt := REGEXP_SUBSTR(str, '[^,]+', 1, i);
dbms_output.put_line(reslt);
I-LOOP YOKUQEDA;
Ukuphela;

Incazelo Yekhodi

Okokuqala, simemezela okuguquguqukayo okubili: eyodwa ukubamba iyunithi yezinhlamvu yokufaka futhi enye ukubamba ingxenye ngayinye ehlukanisiwe yeyunithi yezinhlamvu. Ngemva kwalokhu, iluphu iqala ukuphindaphinda esigabeni ngasinye seyunithi yezinhlamvu. Umqondo uwukuhlukanisa intambo kukhoma ngalinye bese uphrinta ingxenye ngayinye.

REGEXP_SUBSTR icelwa ngaphakathi kweluphu ukuze ifane nephethini esegimentini ngayinye, iqala endaweni yokuqala yesegimenti ngayinye futhi ifanise isenzeko esisodwa ngesikhathi. Ngokuqondile, '[^,]+' yisisho esivamile esifana nesenzeko esisodwa noma eziningi zanoma yiluphi uhlamvu ngaphandle kwekhefana. Ingxenye ngayinye efanisiwe bese iphrintwa kusetshenziswa i- dbms_output.put_line umyalo.

Eminye Imisebenzi Ewusizo Yezintambo ku-Oracle SQL

Ngaphezu kwe REGEXP_SUBSTR, I-Oracle SQL ihlinzeka ngemisebenzi eminingana enamandla yokukhohlisa izintambo:

  • I-SUBSTR: Ibuyisela ingxenye yeyunithi yezinhlamvu, iqala endaweni ethile.
  • Susa esikhundleni: Ifaka esikhundleni sazo zonke izenzeko zeyunithi yezinhlamvu eshiwo.
  • HUMUSHA: Kuhunyushwa izinhlamvu ngazinye kuyunithi yezinhlamvu zibe ezinye izinhlamvu.
  • INSTR: Ibuyisela indawo yochungechunge oluncane kuyunithi yezinhlamvu.

Ukwenza kahle le misebenzi kungakhuphula kakhulu ukusebenza kahle kwakho lapho usebenza neyunithi yezinhlamvu ku-Oracle SQL. Azinikezi kuphela izixazululo ezilula kodwa futhi zikuvumela ukuthi usebenzise amandla emvelo olimi lwe-Oracle SQL ukuze kusetshenziswe idatha nokuhlaziya.

Okuthunyelwe okuhlobene:

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