DECLARE @x xml

SET @x = '<?xml version="1.0" encoding="utf-8"?>

<getDealDetail>

<errorCode>0</errorCode>

<errorMessage></errorMessage>

<buyerName></buyerName>

<buyerUin>284073437</buyerUin>

<buyerRemark></buyerRemark> 

</getDealDetail>'

SELECT @x.query('/getDealDetail/buyerUin')