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    <p>I can see two basic ways of doing this...<br> 1. Group it all up, ignoring the a->b and b->a and then self join the results.<br> 2. Rearrange your data with the "lowest" ip address in the 'src' field, but also create a 'direction' field. </p> <p>Option 2 is probably the way I'd go...</p> <pre><code>SELECT SrcAddress, SrcPort, DestAddress, DestPort, SUM(AtoB) + SUM(BtoA), SUM(AtoB), SUM(BtoA) FROM ( SELECT CASE WHEN SrcAddress &lt; DestAddress THEN SrcAddress ELSE DestAddress END AS SrcAddress, CASE WHEN SrcAddress &lt; DestAddress THEN SrcPort ELSE DestPort END AS SrcPort, CASE WHEN SrcAddress &lt; DestAddress THEN DestAddress ELSE SrcAddress END AS DestAddress, CASE WHEN SrcAddress &lt; DestAddress THEN DestPort ELSE ScrPort END AS DestPort, CASE WHEN SrcAddress &lt; DestAddress THEN Bytes ELSE 0 END AS AtoB, CASE WHEN SrcAddress &lt; DestAddress THEN 0 ELSE Bytes END AS BtoA FROM PacketHeaders ) AS [data] GROUP BY SrcAddress, SrcPort, DestAddress, DestPort </code></pre> <p><strong>EDIT</strong></p> <p>A couple of other answers have version of what I called option 1. I'll have a go at it too rather than spamming comments on people's answers :(</p> <pre><code>SELECT ISNULL([AtoB].SrcAddress, [BtoA].DestAddress) ISNULL([AtoB].SrcPort, [BtoA].DestPort) ISNULL([AtoB].DestAddress, [BtoA].SrcAddress) ISNULL([AtoB].DestPort, [BtoA].SrcPort) ISNULL([AtoB].Bytes,0) + ISNULL([BtoA].Bytes,0), ISNULL([AtoB].Bytes,0), ISNULL([BtoA].Bytes,0) FROM ( SELECT SrcAddress, SrcPort, DestAddress, DestPort, SUM(Bytes) AS Bytes FROM PacketHeaders WHERE SrcAddress &lt;= DestAddress GROUP BY SrcAddress, SrcPort, DestAddress, DestPort ) AS [AtoB] FULL OUTER JOIN ( SELECT SrcAddress, SrcPort, DestAddress, DestPort, SUM(Bytes) AS Bytes FROM PacketHeaders WHERE SrcAddress &gt; DestAddress GROUP BY SrcAddress, SrcPort, DestAddress, DestPort ) AS [BtoA] ON [AtoB].SrcAddress = [BtoA].DestPort AND [AtoB].SrcPort = [BtoA].DestAddress AND [AtoB].DestAddress = [BtoA].SrcPort AND [AtoB].DestPort = [BtoA].SrcAddress </code></pre> <p>But I did say I wouldn't do it that way...</p>
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    1. COIf I want to see a Total Bytes Column I have to encapsulate this all within another SELECT statement. Is there a cleaner way?
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    2. COI added the line "SUM(AtoB) + SUM(BtoA)," for you...
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    3. COAre you sure that SQL Server CTE supports IsNull? I found this post: http://sqlserverce.org/blogs/faq/archive/2007/02/16/isnull-v-s-coalesce.aspx
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