update修改为merge（max+decode）优化

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

AND ORG = 242

AND BATCH_DATE = TO_CHAR(LAST_DAY(A.PRIOR_BILLING_DATE),

'yyyymmdd')) + 0.99999),

USD_PAYMENT =

(SELECT NVL(SUM(POSTING_AMT),

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