sql 优化 -- sql中的自定函数

Long run sql:

              MERGE INTO INTITMRTNPARAM D
              USING (
                           SELECT A.INRFILENM,A.INRSTAT,A.INRDEPCD,A.INRITMCD,A.INRSUBCD,A.INRSUPCD,A.INRSTOCD
                           FROM INTITMRTNPARAM A,INTITMRTNPARAM B
                           WHERE 1=1
                             AND A.ROWID <> B.ROWID
                             AND A.INRFILENM = B.INRFILENM
                             AND A.INRSTAT   = 0
                             AND B.INRSTAT   = 0
                             AND A.INRFILENM = p_filenm
                             AND B.INRFILENM = p_filenm
                             AND A.INRDEPCD  = B.INRDEPCD
                             AND A.INRITMCD  = B.INRITMCD
                             AND PKCRS.CHECKINCLUDECUSTTYPE(NVL(A.INRSUBCD,'ALL'),NVL(B.INRSUBCD,'ALL')) = 1
                             AND PKCRS.CHECKINCLUDECUSTTYPE(NVL(A.INRSUPCD,'ALL'),NVL(B.INRSUPCD,'ALL')) = 1
                             AND PKCRS.CHECKINCLUDECUSTTYPE(NVL(A.INRSTOCD,'ALL'),NVL(B.INRSTOCD,'ALL')) = 1
                           GROUP BY A.INRFILENM,A.INRSTAT,A.INRDEPCD,A.INRITMCD,A.INRSUBCD,A.INRSUPCD,A.INRSTOCD
                    ) E
              ON  ( D.INRFILENM     = E.INRFILENM
                    AND D.INRSTAT   = E.INRSTAT
                    AND D.INRDEPCD  = E.INRDEPCD
                    AND D.INRITMCD  = E.INRITMCD
                    AND DECODE(TRIM(NVL(D.INRSUBCD,'')),'','NULL',TRIM(D.INRSUBCD)) = DECODE(TRIM(NVL(E.INRSUBCD,'')),'','NULL',TRIM(E.INRSUBCD))
                    AND DECODE(TRIM(NVL(D.INRSUPCD,'')),'','NULL',TRIM(D.INRSUPCD)) = DECODE(TRIM(NVL(E.INRSUPCD,'')),'','NULL',TRIM(E.INRSUPCD))
                    AND DECODE(TRIM(NVL(D.INRSTOCD,'')),'','NULL',TRIM(D.INRSTOCD)) = DECODE(TRIM(NVL(E.INRSTOCD,'')),'','NULL',TRIM(E.INRSTOCD)) )
              WHEN MATCHED THEN
              UPDATE SET  D.INRERRNO  = 2,
                          D.INRERRMES = D.INRERRMES || ', Dupplicate item',
                          D.INRUPD    = p_date,
                          D.INRUSR    = p_user;

Long sql 中调用的function（checkIncludeCustType）：

   FUNCTION checkIncludeCustType(p_custType1 PRITSPHDR.TSPHCUSTYPE%TYPE,p_custType2 PRITSPHDR.TSPHCUSTYPE%TYPE) RETURN NUMBER IS
        v_check NUMBER(1);
    BEGIN
        IF p_custType2 IS NULL OR p_custType1 IS NULL THEN
            RETURN 1;
        END IF;
        BEGIN
            SELECT 1
            INTO   v_check
            FROM (SELECT LEVEL,
                         SUBSTR (
                         STRING_TO_TOKENIZE,
                         DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL-1)+1),
                         INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL) - DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL-1)+1)
                         ) AS Token
                    FROM ( SELECT p_custType1||',' AS STRING_TO_TOKENIZE, ',' AS DELIMITER FROM DUAL)
                 CONNECT BY INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL)>0
                   ORDER BY LEVEL ASC
                 ) custtype1,
                 (SELECT LEVEL,
                         SUBSTR ( STRING_TO_TOKENIZE,
                                  DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL-1)+1),
                                  INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL) - DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL-1)+1)
                                ) AS Token
                   FROM ( SELECT p_custType2||',' AS STRING_TO_TOKENIZE, ',' AS DELIMITER FROM DUAL)
                CONNECT BY INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL)>0
                  ORDER BY LEVEL ASC
                 ) custtype2
           WHERE custtype1.token = custtype2.token
             AND rownum = 1;
        EXCEPTION WHEN NO_DATA_FOUND THEN
          v_check := 0;
        END;
        RETURN v_check;
    END checkIncludeCustType;

优化后：

          UPDATE INTITMRTNCON D
             SET D.INRERRNO = 2, D.INRERRMES = D.INRERRMES || ', Dupplicate item'  , D.INRUPD    = p_date, D.INRUSR    = p_user
           WHERE INRFILENM = p_filenm AND  INRSTAT   = 0
            AND (INRFILENM, INRSTAT, INRDPCD, INRITMCD, NVL(INRSUBCD, 'ALL'),
                  NVL(INRSUPCD, 'ALL')) IN
                 (SELECT INRFILENM, INRSTAT, INRDPCD, INRITMCD, NVL(INRSUBCD, 'ALL'), NVL(INRSUPCD, 'ALL')
                    FROM (SELECT T.INRFILENM, T.INRSTAT, T.INRDPCD, T.INRITMCD, T.INRSUBCD, T.INRSUPCD
                            FROM INTITMRTNCON T
                           WHERE INSTR(nvl(trim(INRSUBCD), 'ALL'), ',') = 0
                             and INSTR(nvl(trim(INRSUPCD), 'ALL'), ',') = 0
                             AND INRFILENM = p_filenm AND  INRSTAT   = 0
                          UNION ALL
                          select a.INRFILENM, a.INRSTAT, a.INRDPCD, a.INRITMCD, a.INRSUBCD, b.INRSUPCD
                            from (SELECT SUBSTR(STRING_TO_TOKENIZE,
                                                DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER,
                                                             1, LEVEL - 1) + 1),
                                                INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL) -
                                                DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER,
                                                             1, LEVEL - 1) + 1))
					                     AS INRSUBCD,
                                         V_ROWID, INRFILENM, INRSTAT, INRDPCD, INRITMCD
                                    FROM (SELECT T.INRSUBCD || ',' AS STRING_TO_TOKENIZE,
                                                 ',' AS DELIMITER, T.ROWID V_ROWID,  INRFILENM,
                                                 INRSTAT, INRDPCD, INRITMCD
                                            FROM INTITMRTNCON T
                                           WHERE INRFILENM = p_filenm AND  INRSTAT   = 0 AND (INSTR(INRSUBCD, ',') >= 1
                                              or INSTR(INRSUPCD, ',') >= 1))
                                  CONNECT BY INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL) > 0) a,
                                 (SELECT SUBSTR(STRING_TO_TOKENIZE,
                                                DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER, 1,  LEVEL - 1) + 1),
                                                INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL) -
                                                DECODE(LEVEL, 1, 1, INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL - 1) + 1)) AS INRSUPCD,
                                         V_ROWID, INRFILENM, INRSTAT, INRDPCD, INRITMCD
                                    FROM (SELECT T.INRSUPCD || ',' AS STRING_TO_TOKENIZE, ',' AS DELIMITER,
                                                 T.ROWID V_ROWID, INRFILENM, INRSTAT, INRDPCD, INRITMCD
                                            FROM INTITMRTNCON T
                                           WHERE INRFILENM = p_filenm AND  INRSTAT   = 0 AND (INSTR(INRSUBCD, ',') >= 1
                                              or INSTR(INRSUPCD, ',') >= 1 ))
                                  CONNECT BY INSTR(STRING_TO_TOKENIZE, DELIMITER, 1, LEVEL) > 0) b
                           where a.v_rowid = b.v_rowid)
                   GROUP BY INRFILENM, INRSTAT, INRDPCD, INRITMCD, INRSUBCD, INRSUPCD
                  HAVING COUNT(*) > 1);