U kunt Oracle-verzamelingen gebruiken. CAST()
gekoppeld aan COLLECT()
kan waarden samenvoegen tot een door de gebruiker gedefinieerde verzameling en vervolgens SET()
zal de duplicaten verwijderen. Dan kun je LISTAGG()
. gebruiken om de verzameling naar een tekenreeks te converteren.
Oracle-configuratie :
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;
Zoekopdracht :
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
);
Uitvoer :
ColA ColB
---- ---------------------------------------
1,2 POW,POWPRO,PRO,PROUTL,TNEUTL,UTL,UTLTNE