Visual FoxPro provides support for null values. This support simplifies the task of representing unknown data and makes it easier to work with Microsoft Access or SQL databases that may contain null values.

Null values are:

• Equal to the absence of any value.

• Different than zero, the empty string (""), or blank.

• Sorted ahead of other data.

• Propagated in calculations and most functions.

Null values affect the behavior of commands and functions, logical expressions, and parameters.

Visual FoxPro support for null values complies with ANSI standards and affects any area of the product where values and expressions are used.

Using NULL in Values and Expressions

See Also