[DATABASE/ORACLE] DML 명령문 : RETURNING 키워드 사용하기

■ DML 명령문에서 RETURNING 키워드를 사용하는 방법을 보여준다.

▶ 예제 코드 (SQL)


-- 직원 테이블을 생성한다.
CREATE TABLE EMP
(
    EMPNO    NUMBER(4, 0)
   ,ENAME    VARCHAR2(10)
   ,SAL      NUMBER(7, 2)
   ,CONSTRAINT PK_EMP PRIMARY KEY (EMPNO)
);

-- 직원 테이블에 데이터를 추가한다.
INSERT INTO EMP VALUES(7369, 'SMITH' ,  800);
INSERT INTO EMP VALUES(7499, 'ALLEN' , 1600);
INSERT INTO EMP VALUES(7521, 'WARD'  , 1250);
INSERT INTO EMP VALUES(7566, 'JONES' , 2975);
INSERT INTO EMP VALUES(7654, 'MARTIN', 1250);
INSERT INTO EMP VALUES(7698, 'BLAKE' , 2850);
INSERT INTO EMP VALUES(7782, 'CLARK' , 2450);
INSERT INTO EMP VALUES(7788, 'SCOTT' , 3000);
INSERT INTO EMP VALUES(7839, 'KING'  , 5000);
INSERT INTO EMP VALUES(7844, 'TURNER', 1500);
INSERT INTO EMP VALUES(7876, 'ADAMS' , 1100);
INSERT INTO EMP VALUES(7900, 'JAMES' , 950 );
INSERT INTO EMP VALUES(7902, 'FORD'  , 3000);
INSERT INTO EMP VALUES(7934, 'MILLER', 1300);

COMMIT;

DECLARE
    V_ENAME EMP.ENAME%TYPE;
    V_SAL   EMP.SAL%TYPE;
BEGIN
    FOR EMPLOYEE_RECORD IN (SELECT * FROM EMP)
    LOOP
        UPDATE EMP
        SET    SAL   = SAL + 100
        WHERE  EMPNO = EMPLOYEE_RECORD.EMPNO
        RETURNING ENAME, SAL INTO V_ENAME, V_SAL;

        DBMS_OUTPUT.PUT_LINE(V_ENAME || ', ' || V_SAL);
    END LOOP;
END;

-- 직원 테이블을 생성한다.

CREATE TABLE EMP

(

EMPNO NUMBER(4, 0)

,ENAME VARCHAR2(10)

,SAL NUMBER(7, 2)

,CONSTRAINT PK_EMP PRIMARY KEY (EMPNO)

);

-- 직원 테이블에 데이터를 추가한다.

INSERT INTO EMP VALUES(7369, 'SMITH' , 800);

INSERT INTO EMP VALUES(7499, 'ALLEN' , 1600);

INSERT INTO EMP VALUES(7521, 'WARD' , 1250);

INSERT INTO EMP VALUES(7566, 'JONES' , 2975);

INSERT INTO EMP VALUES(7654, 'MARTIN', 1250);

INSERT INTO EMP VALUES(7698, 'BLAKE' , 2850);

INSERT INTO EMP VALUES(7782, 'CLARK' , 2450);

INSERT INTO EMP VALUES(7788, 'SCOTT' , 3000);

INSERT INTO EMP VALUES(7839, 'KING' , 5000);

INSERT INTO EMP VALUES(7844, 'TURNER', 1500);

INSERT INTO EMP VALUES(7876, 'ADAMS' , 1100);

INSERT INTO EMP VALUES(7900, 'JAMES' , 950 );

INSERT INTO EMP VALUES(7902, 'FORD' , 3000);

INSERT INTO EMP VALUES(7934, 'MILLER', 1300);

COMMIT;

DECLARE

V_ENAME EMP.ENAME%TYPE;

V_SAL EMP.SAL%TYPE;

BEGIN

FOR EMPLOYEE_RECORD IN (SELECT * FROM EMP)

LOOP

UPDATE EMP

SET SAL = SAL + 100

WHERE EMPNO = EMPLOYEE_RECORD.EMPNO

RETURNING ENAME, SAL INTO V_ENAME, V_SAL;

DBMS_OUTPUT.PUT_LINE(V_ENAME || ', ' || V_SAL);

END LOOP;

END;