For a data-driven subscription - you need a query that returns the following information:
Select DistributionName
, SendTo
, SendCc
, SendBcc
, ReplyTo
, IncludeReport
, iif(RenderFormat = 'Excel', 'ExcelOpenXml', RenderFormat) As RenderFormat
, IncludeLink
From {some table}
Where {some conditions};
You then map each field in the subscription to the appropriate field returned.
If you have 2 rows in the results - then 2 emails will be sent based on the values in the SendTo column.