Group By 에서 문자열 합치기 - 버전별 정리

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WITH t(type, name, code) AS ( SELECT '과일', '사과', '0' FROM dual UNION ALL SELECT '과일', '레몬', '1' FROM dual UNION ALL SELECT '과일', '포도', '2' FROM dual UNION ALL SELECT '과일', '참외', '3' FROM dual UNION ALL SELECT '채소', '오이', '0' FROM dual UNION ALL SELECT '채소', '당근', '1' FROM dual UNION ALL SELECT '채소', '호박', '2' FROM dual ) SELECT type , SUBSTR(XMLAgg(XMLElement(x, ',', name) ORDER BY code).Extract('//text()'), 2) name_9i , wm_concat(name) name_10g , ListAgg(name, ',') WITHIN GROUP(ORDER BY code) name_11g FROM t GROUP BY type ORDER BY type ;

<실행 결과>

TYPE	NAME_AGG
과일	사과,레몬,포도,참외
채소	오이,당근,호박

출처 : http://www.oracleclub.com/article/55512