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关联字段BUSINESS_SOURCE_CODE || BUSINESS_SOURCE_DETAIL_CODE ||
CHANNEL_SOURCE_CODE ||
DECODE(CHANNEL_SOURCE_DETAIL_CODE,
‘ ‘,
‘0‘,
NVL(CHANNEL_SOURCE_DETAIL_CODE, ‘0‘)) = pk_code
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原文地址：http://www.cnblogs.com/zhangwensi/p/4776402.html
