哪些源数据项可用,哪些不可用?
表达式由源数据项、目标数据项、以及源数据项之间的关系构成,并符合一定表示规则。
The mapping expression composes three parts: Source Data Elements, Target Data Elements, and Relationship among Source Data Elements, the express rules of the three parts being implemented.
数据源中是否有其他可用但没有请求的有趣数据项呢?
Are there other interesting data items that are available in the data sources but have not been requested?
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