update修改为merge(max+decode)优化

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    记录日期: 2014-07-30 14:25:27

    ------------- 优化方法: 减少大表扫描次数采用max+decode方式

    原sql语句:

    UPDATE RKO_ACCT_STATUS A SET RMB_PAYMENT = (SELECT NVL(SUM(POSTING_AMT), 0) FROM RKOT_ACCT_PMT_PRIOR B WHERE B.ACCT = A.ACCT AND ORG = '242' AND POSTING_DATE BETWEEN A.PRIOR_BILLING_DATE + 1 AND ADD_MONTHS(A.PRIOR_BILLING_DATE, 1) AND TXN_DATE <= (SELECT CASE WHEN USER_DATE_10=0 THEN NULL ELSE TO_DATE(USER_DATE_10, 'yyyyddd') END FROM RKOH_HAPS_AMBS_KD WHERE ACCT = A.ACCT AND ORG = 242 AND BATCH_DATE = TO_CHAR(LAST_DAY(A.PRIOR_BILLING_DATE),'yyyymmdd')) + 0.99999), USD_PAYMENT = (SELECT NVL(SUM(POSTING_AMT), 0) FROM RKOT_ACCT_PMT_PRIOR B WHERE B.ACCT = A.ACCT AND ORG = '241' AND POSTING_DATE BETWEEN A.PRIOR_BILLING_DATE + 1 AND ADD_MONTHS(A.PRIOR_BILLING_DATE, 1) AND TXN_DATE <= (SELECT CASE WHEN USER_DATE_10=0 THEN NULL ELSE TO_DATE(USER_DATE_10, 'yyyyddd') END FROM RKOH_HAPS_AMBS_KD WHERE ACCT = A.ACCT AND ORG = 241 AND BATCH_DATE = TO_CHAR(LAST_DAY(A.PRIOR_BILLING_DATE),'yyyymmdd')) + 0.99999) WHERE TO_CHAR(A.PRIOR_BILLING_DATE, 'yyyymm') = :B1;

    格式化一下:

    UPDATE RKO_ACCT_STATUS A

    SET RMB_PAYMENT =

    (SELECT NVL(SUM(POSTING_AMT),

    0)

    FROM RKOT_ACCT_PMT_PRIOR B

    WHERE B.ACCT = A.ACCT

    AND ORG = '242'

    AND POSTING_DATE BETWEEN A.PRIOR_BILLING_DATE + 1 AND

    ADD_MONTHS(A.PRIOR_BILLING_DATE,

    1)

    AND TXN_DATE <=

    (SELECT CASE

    WHEN USER_DATE_10 = 0 THEN

    NULL

    ELSE

    TO_DATE(USER_DATE_10,

    'yyyyddd')

    END

    FROM RKOH_HAPS_AMBS_KD

    WHERE ACCT = A.ACCT

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