[DATABASE/ORACLE] XMLAGG, XMLELEMENT 함수를 사용해 여러 행의 데이터를 한 컬럼에 결합하기

■ XMLAGG, XMLELEMENT 함수를 사용해 여러 행의 데이터를 한 컬럼에 결합하는 방법을 보여준다.

 

▶ 예제 코드 (SQL)

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

/*
COUNTRY KING_NAME
------- --------------------------
고구려  동명성왕,유리왕,대무신왕
백제    온조왕,다루왕,기루왕
신라    남해왕,유리이사금,박혁거세
*/