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What is the difference between the Data Bank Control Number (DCN) in the Query Report Status Data Record (QRSD) and the DCN in the Query Status Data Record (QSTA)?

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What is the difference between the Data Bank Control Number (DCN) in the Query Report Status Data Record (QRSD) and the DCN in the Query Status Data Record (QSTA)?

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Both the QSTA and QRSD data records are returned in query responses. The difference between the QSTA and the QRSD is that the QSTA data record provides summary information about the query subject while the QRSD data record provides summary information about a report returned in response to the query. If the query did not match to any reports in the Data Bank, the QRSD data record will not be provided in the response. The DCN in the QSTA data record is a unique identifier for the specific query subject. The DCN in the QRSD data record uniquely identifies the report that the subject matched.

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