Du kan använda Oracles-samlingar. CAST()
parat med COLLECT()
kan aggregera värden till en användardefinierad samling och sedan SET()
kommer att bli av med dubbletterna. Sedan kan du använda LISTAGG()
för att konvertera samlingen till en sträng.
Oracle-inställningar :
CREATE TYPE intlist IS TABLE OF INT;
/
CREATE TYPE stringlist IS TABLE OF VARCHAR2(4000);
/
CREATE TABLE table_name ( ColA NUMBER(5,0), ColB VARCHAR2(20) );
INSERT INTO table_name
SELECT 1, 'POW' FROM DUAL UNION ALL
SELECT 2, 'POW' FROM DUAL UNION ALL
SELECT 1, 'POWPRO' FROM DUAL UNION ALL
SELECT 1, 'PRO' FROM DUAL UNION ALL
SELECT 2, 'PRO' FROM DUAL UNION ALL
SELECT 1, 'PROUTL' FROM DUAL UNION ALL
SELECT 1, 'TNEUTL' FROM DUAL UNION ALL
SELECT 1, 'UTL' FROM DUAL UNION ALL
SELECT 1, 'UTLTNE' FROM DUAL;
Fråga :
SELECT ( SELECT LISTAGG( COLUMN_VALUE, ',' )
WITHIN GROUP ( ORDER BY COLUMN_VALUE )
FROM TABLE( ColA ) ) AS ColA,
( SELECT LISTAGG( COLUMN_VALUE, ',' )
WITHIN GROUP ( ORDER BY COLUMN_VALUE )
FROM TABLE( ColB ) ) AS ColB
FROM (
SELECT SET( CAST( COLLECT( ColA ORDER BY ColA ) AS INTLIST ) ) ColA,
SET( CAST( COLLECT( ColB ORDER BY ColB ) AS STRINGLIST ) ) ColB
FROM table_name
);
Utdata :
ColA ColB
---- ---------------------------------------
1,2 POW,POWPRO,PRO,PROUTL,TNEUTL,UTL,UTLTNE