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Exclude dublicate record from table using join

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :Sql Server

I have a table that contains sush rows:

id  n  id  n

1  a   2  b

2  b   1  a

I need to exclude from it rows like that. I meaning that one of that row should be exclude and other should stay.


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