CREATE TABLE TBL_MD5
(
  CODE      VARCHAR2(25)    NOT NULL,
  MD5       RAW(16)         NOT NULL,
  VAL       VARCHAR2(250), 
  PRIMARY KEY (CODE, MD5) ENABLE VALIDATE
)
ORGANIZATION INDEX;

DECLARE
    TYPE t_md5      IS TABLE OF TBL_MD5%ROWTYPE;
       
    arr_MD5   t_md5 := t_md5();
BEGIN
    FORALL i IN 1..arr_MD5.COUNT
        MERGE INTO TBL_MD5 DST
        USING (
            SELECT
                arr_MD5(i).CODE     AS CODE,
                arr_MD5(i).MD5      AS MD5,
                p_ext_file          AS VAL                        
            FROM DUAL
        ) SRC
        ON (
            DST.CODE = SRC.CODE
        )
        WHEN MATCHED THEN UPDATE
        SET
            MD5 = SRC.MD5,
            VAL = SRC.VAL
        WHEN NOT MATCHED THEN INSERT
        VALUES(
            SRC.CODE,
            SRC.MD5,
            SRC.VAL
        );
END;