Om du använder Oracle 10g kan du använda DECODE
funktion för att svänga raderna till kolumner:
CREATE TABLE doc_tab (
loan_number VARCHAR2(20),
document_type VARCHAR2(20),
document_id VARCHAR2(20)
);
INSERT INTO doc_tab VALUES('992452533663', 'Voters ID', 'XPD0355636');
INSERT INTO doc_tab VALUES('992452533663', 'Pan card', 'CHXPS5522D');
INSERT INTO doc_tab VALUES('992452533663', 'Drivers licence', 'DL-0420110141769');
COMMIT;
SELECT
loan_number,
MAX(DECODE(document_type, 'Voters ID', document_id)) AS voters_id,
MAX(DECODE(document_type, 'Pan card', document_id)) AS pan_card,
MAX(DECODE(document_type, 'Drivers licence', document_id)) AS drivers_licence
FROM
doc_tab
GROUP BY loan_number
ORDER BY loan_number;
Utdata:
LOAN_NUMBER VOTERS_ID PAN_CARD DRIVERS_LICENCE ------------- -------------------- -------------------- -------------------- 992452533663 XPD0355636 CHXPS5522D DL-0420110141769
Du kan uppnå samma sak med Oracle PIVOT
klausul, införd i 11g:
SELECT *
FROM doc_tab
PIVOT (
MAX(document_id) FOR document_type IN ('Voters ID','Pan card','Drivers licence')
);
SQLFiddle-exempel med båda lösningarna:SQLFiddle-exempel
Läs mer om pivoting här:Pivot In Oracle av Tim Hall