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The following table describes how commands and functions interpret null values.
| Data type | Behavior |
|---|---|
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Most logical expressions that evaluate to .NULL. return .NULL. or generate an error. EMPTY(В ), ISBLANK(В ), and ISNULL(В ) are exceptions. |
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Numeric expressions that evaluate to .NULL. return .NULL. A numeric function evaluates to .NULL. when passed a null value. |
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Date expressions containing null values return .NULL. |