Get last (distinct) 1000 customers


I need to get last 1000 customers  (customerid) from invoices table. But if a Customer is repetead more than 1 time, i only need 1 row.

Invoices Table

best regards
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Aneesh RetnakaranDatabase AdministratorCommented:
SELECT   DISTINCT TOP (1000) CustmerID from Invoice group by CustmerID
awking00Information Technology SpecialistCommented:
I assume one of the date fields determines which is last and that's the one that needs to be in the order by clause -
select top 1000 customerid from
(select customerid from
 (select customerid,
  row_number() over (partition by customerid order by date desc) rn
  from invoices) x
 where rn = 1) y

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