I'm thinking that a few additional parenthesis might be in order:
If it was a table aliasing problem, it would be a different error.Code:WHERE ((DataOraPlecare >= @DataOraPlecare) AND (DataOraPlecare <= @DataOraSosire)) AND ((DataOraSosire >= @DataOraPlecare) AND (DataOraSosire <= @DataOraSosire)) AND ((tab2.IdTip = @TipAutomobil) AND (tab2.TipCombustibil = @TipCombustibil))
-tg




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