"select distinct on 2 columns" Code Answer's
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select count distinct multiple columns sql server

SELECT COUNT(DISTINCT (CHECKSUM(DocumentId,DocumentSessionId)) + CHECKSUM(REVERSE(DocumentId),REVERSE(DocumentSessionId)) )
FROM DocumentOutPutItems
Source: stackoverflow.com
select distinct on 2 columns

SELECT agent_code, ord_amount, cust_code, ord_num
FROM orders
WHERE agent_code='A002';
Source: www.w3resource.com
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