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| This example shows how to use the RELREC dataset to represent related information that is submitted as multiple datasets that have an identifying variable in common. |
In this example, all the records with the same --SPID across the domains with the same USUBJID are being related to each other. Because this relationship exists for all values of USUBJID and all values of --SPID (specified in IDVARVAL), both USUBJID and IDVARVAL are null.
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Because IDVAR identifies the keys that can be used to merge/join records between the datasets, the root values (e.g., --SPID in this example) for IDVAR are the same for all records with the same RELID. --SEQ cannot be used because --SEQ only has meaning within a subject within a domain, not across domains.
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