Decision box in a SQL query...

When I make a SQL query with a decision box field, the results are wrong...

When I ask

Select * from "table" where "decisionbox" = 'No' ;the result is ok.

But when I ask ... "decisionbox" = 'Yes', the result is wrong!

I've tried with true / false and it's wrong too...

I suspect that the problem is me... What am I doing wrong?

Please help me

Thank you very much

Sorry for posting too many questions...

mpasquali