Pp. ca DATA1 < DATA2 si @D1 < @D2 atunci conditiile pot fi formulate astfel:
NEGATIE ( DATA1 < DATA2 < @D1 < @D2 )
SAU
NEGATIE ( @D1 < @D2 < DATA1 < DATA2 )
iar in SQL:
SELECT ...
FROM ...
WHERE NOT( DATA2 < @D1 OR @D2 < DATA1 )