All these are evaluated as True:

SELECT * FROM RDB$DATABASE WHERE 123 IN (123, 456);
SELECT * FROM RDB$DATABASE WHERE 123 NOT IN (123, 456);
SELECT * FROM RDB$DATABASE WHERE NOT (123 IN (123, 456));


(Firebird-3.0.0.29509-0_Win32.7z)

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Magic Quadrant for Content-Aware Data Loss Prevention
Research study explores the data loss prevention market. Includes in-depth
analysis on the changes within the DLP market, and the criteria used to
evaluate the strengths and weaknesses of these DLP solutions.
http://www.accelacomm.com/jaw/sfnl/114/51385063/
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