Help In Understing Logic For Generating Row Numbers?

May 18, 2006

Hello,

I found this query below that creates a Row Number column. Can someone help me to explain what the logic behind it is?

Thanks for help!

--------------------------------------------------------------------------------------------------------------------------------------------------

SELECT orderid, custid, orderdate,

(SELECT COUNT(*)

FROM dbo.Orders AS O2

WHERE O2.orderid <= O1.orderid) AS rownum

FROM dbo.Orders AS O1

ORDER BY orderid;

----------------------------------------------------------------------------------------------------------------------------------------------

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ModelPartId ModelId PartId
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