View Multiple Calendars with WebDAV

I am successfully displaying calendar appointments for a specific Exchange account. I do this by using WebDav and passing a request string like the following:

"<?xml version=\"1.0\"?><g:searchrequest xmlns:g=\"DAV:\"><g:sql>SELECT \"urn:schemas:calendar:location\", \"urn:schemas:httpmail:subject\", \"urn:schemas:calendar:dtstart\", \"urn:schemas:calendar:dtend\", \"urn:schemas:calendar:busystatus\", \"urn:schemas:calendar:instancetype\" FROM Scope('SHALLOW TRAVERSAL OF \"\"') WHERE NOT \"urn:schemas:calendar:instancetype\" = 1 AND \"DAV:contentclass\" = 'urn:content-classes:appointment' AND \"urn:schemas:calendar:dtstart\" > '2011/10/04 00:00:00' AND \"urn:schemas:calendar:dtend\" &lt; '2011/10/05 00:00:00' ORDER BY \"urn:schemas:calendar:dtstart\" ASC</g:sql></g:searchrequest>"

Note that the above string has a SELECT statement with a FROM clause, similar to most database queries. The FROM clause references the calendar for the Exchange account Allen ("\"). This (among other lines of code not included here) successfully retrieves and displays Allen's appointments.

What I want to do is retrieve and display the appointments for 2 or more calendars at the same time. So my question is, how do I chain 2 or more requests in the above string?

From a standard database query standpoint, maybe a JOIN clause can be added in order to include another source (calendar). Maybe the above SELECT could have Allen's appointments (FROM "\") and then include Bob's appointments with something like JOIN "\". But JOINs genearlly imply that there is some relation between the 2 sources. But Allen and Bob's calendar data are completely independent appointments, and not related in any way.

What may be more appropriate is a UNION statement that would include the SELECTed data from Allen's calendar along with (UNION) the SELECTed data from Bob's calendar.

The bottom line is that I can't figure out how to modify the above string to request calendar data from multiple sources. Does anyone know how to make this work?

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Sadly, you can't do that with Exchange's WebDAV SQL.  It is only a tiny subset of ANSI SQL.  There is a list of unsupported SQL commands here:

You'll need to get the data from both calendars separately, and then do the hard work in code.

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