sql server - Top 1 for each joined record -


in sql server query, want return @ 1 lostreason each booking. however, sub-query seems returning first record lostbusiness table every booking. let me know if need clarify.

select             bookings.bookingnumber, lost.lostreason                 bookings      left outer join(select top (1)                         bookingnumber,                         lostreason                                                        lostbusiness) lost on bookings.bookingnumber = lost.bookingnumber

if need more 1 column

select           bookings.bookingnumber, lost.* bookings     outer apply     (          select top 1             lost.bookingnumber,              lost.lostreason,             --other columns         lostbusiness lost         bookings.bookingnumber = lost.bookingnumber         order -- put order here     ) lost

or

;with cte (     select               *,         row_number() on (partition bookings.bookingnumber order /* ??? */) row_num     bookings         left outer join lostbusiness lost on bookings.bookingnumber = lost.bookingnumber  )  select * cte row_num = 1

if need more 1 column

select           bookings.bookingnumber, max(lost.lostreason) lostreason bookings     left outer join lostbusiness lost on bookings.bookingnumber = lost.bookingnumber group bookings.bookingnumber

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