Selecting data from XML - sql-server

Question

I'm trying to insert a row based on data extracted from a chunk of XML. Some columns need to initialized to node values a couple of nodes "deep" in the XML structure.
I can't seem to the query right. Here's what I got:
declare #xmlRaw xml = '
<LogEntry>
<SummaryMessage>Something bad happened</SummaryMessage>
<Exception>
<Type>System.ApplicationException</Type>
<Message>A test of the error handling</Message>
</Exception>
</LogEntry>'
select
LogEntryColumn.value('SummaryMessage[1]', 'varchar(10)') as SummaryMessage, -- works fine
LogEntryColumn.query('Exception[1]').value('Message[1]', 'varchar(10)') as ExMessage -- not working
from
#xmlRaw.nodes('LogEntry[1]') as LogEntryTable(LogEntryColumn)
This outputs:
SummaryMessage ExMessage
-------------- ----------
Something NULL
I've tried a raft of variations for the "ExMessage" column query but no joy.
Note that I'm using "LogEntryColumn.query(...).value(...)" because I want to check how that form performs versus something like:
select
LogEntryColumn.value('SummaryMessage[1]', 'varchar(10)') as SummaryMessage, -- works fine
ExceptionEntryColumn.value('Message[1]', 'varchar(10)') as ExMessage -- not working
from
#xmlRaw.nodes('LogEntry[1]') as LogEntryTable(LogEntryColumn)
outer apply #xmlData.nodes('LogEntry[1]/Exception') as ExceptionTable(ExceptionEntryColumn)
Basically I'm wondering if multiple "outer apply" from clauses is better/worse than multiple .query(...) invocations.

Answer 1

Here is what you need.
SQL
DECLARE #xmlRaw XML =
N'<LogEntry>
<SummaryMessage>Something bad happened</SummaryMessage>
<Exception>
<Type>System.ApplicationException</Type>
<Message>A test of the error handling</Message>
</Exception>
</LogEntry>';
SELECT c.value('(SummaryMessage/text())[1]', 'varchar(100)') AS SummaryMessage
, c.value('(Exception/Message/text())[1]', 'varchar(100)') AS ExMessage
FROM #xmlRaw.nodes('/LogEntry') AS t(c);
Output
+------------------------+------------------------------+
| SummaryMessage | ExMessage |
+------------------------+------------------------------+
| Something bad happened | A test of the error handling |
+------------------------+------------------------------+