(오라클) 여러행을 하나의 컬럼으로 합치기

--가상 테이블
WITH TEST_TABLE AS (
    SELECT '고구려' COUNTRY, '1대' ST, '동명성왕'   KING_NM FROM DUAL UNION ALL
    SELECT '고구려' COUNTRY, '3대' ST, '대무신왕'   KING_NM FROM DUAL UNION ALL
    SELECT '백제'   COUNTRY, '1대' ST, '온조왕'     KING_NM FROM DUAL UNION ALL
    SELECT '고구려' COUNTRY, '2대' ST, '유리왕'     KING_NM FROM DUAL UNION ALL
    SELECT '백제'   COUNTRY, '3대' ST, '기루왕'     KING_NM FROM DUAL UNION ALL
    SELECT '신라'   COUNTRY, '1대' ST, '남해왕'     KING_NM FROM DUAL UNION ALL
    SELECT '신라'   COUNTRY, '1대' ST, '박혁거세'   KING_NM FROM DUAL UNION ALL
    SELECT '백제'   COUNTRY, '2대' ST, '다루왕'     KING_NM FROM DUAL UNION ALL
    SELECT '신라'   COUNTRY, '1대' ST, '유리이사금' KING_NM FROM DUAL
)
--조회 쿼리
SELECT
    COUNTRY
  , SUBSTR(
      XMLAGG(XMLELEMENT(COL ,',', KING_NM) ORDER BY ST).EXTRACT('//text()').GETSTRINGVAL()
    , 2) KING_NM
FROM TEST_TABLE
GROUP BY COUNTRY

조회전

조회후