The "Orion SDK.pdf" that comes with the SDK should have a list of supported functions and various constructs.
For the query in your comment, here is a SWQL version that returns the utilization for all interfaces in the last 24 hours
SELECT InterfaceID, AVG(InAveragebps) AS InAvgBps, MIN(InMinbps) AS InMinBps, MAX(InMaxbps) AS InMaxBps
WHERE DateTime > (GETDATE() - 1)
GROUP BY InterfaceID
SWQL is very similar to SQL. There are differences and those should be documented in that pdf.