"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
select distinct on 2 columns
SELECT agent_code, ord_amount, cust_code, ord_num FROM orders WHERE agent_code='A002';
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