I don't know of any references except for the examples that are part of the download. Probably, the best thing to do is to find information on SQL. You can try doing a Google search for SQL tutorials. Also, you can design a query in Access and from the View menu, select SQL View to see the correct syntax.
p.s. Since this question is not really related to DAQ, you should post any further similar questions in the LabVIEW forum.
