Question

I Have a query with Two Select Clause combines with UNION.I want to select only top first row. How can i do that Using Union ?

Select Fault,OccurredOn From ATMStatus Where Ticket=189703 // This Will retrieve single record as the primary key is applied
Union 
Select Fault,OccurredOn From ATMStatusHistory Where Resolved=0 AND Ticket=189703 Order By OccurredOn Desc

Answer 1

select top 1 * from 
(
                 Select Fault,OccurredOn 
                 From ATMStatus
                 Where Ticket=189703
                 Union 
                 Select Fault,OccurredOn
                 From ATMStatusHistory
                 Where Resolved=0 AND Ticket=189703
) x
Order By OccurredOn Desc