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    <p>Let me change a little your update query:</p> <pre><code> declare @passedXML xml set @passedXML='&lt;root&gt;&lt;record&gt;&lt;name&gt;Sam&lt;/name&gt;&lt;age&gt;37&lt;/age&gt;&lt;comments /&gt;&lt;/record&gt;&lt;record&gt;&lt;name&gt;Dan&lt;/name&gt;&lt;age&gt;32&lt;/age&gt;&lt;comments /&gt;&lt;/record&gt;&lt;/root&gt;' DECLARe @test TABLE (id bigint IDENTITY(1,1),name nvarchar(100), age int, comments varchar(255)) insert into @test (name, age, comments) select x.record.query('name').value('.', 'varchar(255)'), x.record.query('age').value('.', 'int'), x.record.query('comments').value('.','varchar(255)') from @passedXML.nodes('root/record') as x(record) set @passedXML='&lt;root&gt;&lt;record&gt;&lt;id&gt;99999&lt;/id&gt;&lt;comments&gt;This is a new comment&lt;/comments&gt;&lt;/record&gt;&lt;record&gt;&lt;id&gt;2&lt;/id&gt;&lt;comments&gt;Michael Michael&lt;/comments&gt;&lt;/record&gt;&lt;/root&gt;' ; with CTE as( SELECT x.record.query('comments').value('.','varchar(255)') comment, x.record.query('id').value('.','int') id from @passedXML.nodes('root/record') as x(record)) update @test set comments = cte.comment FROM @test T JOIN CTE oN cte.id=t.id </code></pre> <p>Update result: <code>(1 row(s) affected)</code></p> <p>SQL server is smart enough to do not update every row. If you look at execution plan, you can see that hash match has only one actual number of rows, not two:</p> <p><img src="https://i.stack.imgur.com/l4NAr.png" alt="enter image description here"> </p> <p>@@RoWCOUNT will show to you 1 too and it is ok.</p> <p>In your example you update <strong>every</strong> row already (if in XML there are no such id, NULL should be inserted in comments)</p>
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    1. COThat is very cool.. I must admit, I have seen CTE statements around, but never really knew what they were for.. yet another adventure! So thank you, perfect example and thanks for including the stats too - certainly makes more sense to only update the row required of course!!
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