In our application (kbdlessons version 1-01) we have just had a case
where a query in our application failed to return a record which
definitely exists. We were able to reproduce this problem using the
Dataviewer page off the app engine dashboard.

We put in this query using the Dataviewer:

SELECT * FROM StudentSubscriptions where StudentKey = 'REBECCA' and
ProductKey = 'Typequick Professional' and AccountKey = 'SIVF'

and got no results. However, if we use just 2 out of the 3 tests (any
2!) the record we want appears amongst the results.

Also, other valid values for StudentKey when used in this 3 part query
do return a record in the Dataviewer page, just not this particular
set of 3 values.

We had to build a new record (under another name) to get the student
going, but have left the troubled record in the database so you can
look at it.

Please let me know how to avoid this rather worrying problem.
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