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 CAST(EmpDetails as XML).query does what within sel
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Aged Yak Warrior

563 Posts

Posted - 11/26/2012 :  10:52:15  Show Profile  Reply with Quote
I have the follwing with in select query
What does it mean as XML and then using .query

What does it do, can someone please explain.

CAST(EmpDetails as XML).query('data(HR_Pay_class)') as PayClass

Thanks a lot for the helpful info.

Aged Yak Warrior

563 Posts

Posted - 11/26/2012 :  11:02:06  Show Profile  Reply with Quote
Understood, it is querying an XML datatype field's data. within that xml data querying particular element.

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Flowing Fount of Yak Knowledge

5155 Posts

Posted - 11/26/2012 :  11:05:03  Show Profile  Reply with Quote
SQL Server has a set of xquery functions (even though it is a rather limited subset of the W3C specifications) for querying, composing, and modifying XML data.

In the statement you posted, you are casting EmpDetails column (which probably is a character type) to an XML type, and then using the xquery function "query" to look for the xml node named "data(HR_Pay_class)".

There is a description of xquery functions in SQL Server here including some examples of the query function that is used in your example: http://msdn.microsoft.com/en-us/library/ms345122(v=sql.90).aspx
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