Sql server xpath conditionnal query - sql

Question

I have a table where one field called 'configuration' is type of XML:
<configuration>
<element value="john" />
<element value="kevin" />
<element value="lisa" />
<element value="david" />
<element value="mike" />
</configuration>
What I would like to do, is to retrieve all the table records or at least count the table records that have a field 'configuration' containing at least one 'element' attribute containing a 'value' attribute equals to 'lisa'.
What I have for the moment, is a query that can retrieve the 'value' attribute of the specified 'element' position, for example:
select Configuration.value('(/configuration/element/#value)[0]', 'nvarchar(max)') // returns me 'john'
select Configuration.value('(/configuration/element/#value)[1]', 'nvarchar(max)') // returns me 'kevin'

Answer 1

This is a bit of pseudo-SQL in the absence of a dataset, and a bit of guesswork; in that I (think) you simply want to return the rows(?) where there is a the node configuration/element has the value property 'lisa'. IF my guess is right, then something like this will work (you'll ened to replace object names in Braces({}):
SELECT {Columns}
FROM [{Your Table}] YT
WHERE EXISTS (SELECT 1
FROM [{Your Table}] E
CROSS APPLY E.[{Your XML Column}].nodes('configuration/element') C(E)
WHERE E.[{Your ID Column}] = YT.[{Your ID Column}]
AND C.E.value('./#value','varchar(50)') = 'lisa');
Example:
WITH VTE AS(
SELECT 1 AS ID,
CONVERT(xml,'<configuration>
<element value="john" />
<element value="kevin" />
<element value="lisa" />
<element value="david" />
<element value="mike" />
</configuration>') AS XMlCol
UNION ALL
SELECT 2 AS ID,
CONVERT(xml,'<configuration>
<element value="craig" />
<element value="donald" />
<element value="jenny" />
<element value="jayne" />
</configuration>') AS XMlCol)
SELECT *
FROM VTE YT
WHERE EXISTS (SELECT 1
FROM VTE E
CROSS APPLY E.XMlCol.nodes('configuration/element') C(E)
WHERE E.ID = YT.ID
AND C.E.value('./#value','varchar(50)') = 'lisa');
This only returns the row with an ID of 1.

Answer 2

Please try the below,
declare #xml as xml
set #xml='<configuration>
<element value="john" />
<element value="kevin" />
<element value="lisa" />
<element value="david" />
<element value="mike" />
</configuration>'
SELECT T.c.value('./#value','nvarchar(250)' ) As element
FROM #xml.nodes('//element') AS T(c)