I am running exactly like you set it up.
SELECT SSN, [Sent to Disbo], [Start Date], [End Date] FROM [M00091 Partial 2 Claims]
UNION SELECT SSN, [Sent to Disbo], [Start Date], [End Date] FROM [M00091 Partial 3 Claims]
UNION SELECT SSN, [Sent to Disbo], [Start Date], [End Date] FROM [M00091...