Question:
When I open my TQuery, why am I getting an "Operation Not Applicable Error" when my TQuery returns no records?

Answer:
If you have Unidirectional set to True for your TQuery this error will occur. If you think you may be in this condition, run a select count(*) query to determine the number of records returned from your Query before running the TQuery.

Note: in Delphi 2 and 3 this condition does not occur.

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