ASA SQL Reference
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ISNULL function [Data type conversion]

Function 

• Returns the first non-NULL expression in the parameter list.

Syntax 

ISNULL ( expression, expression [ , ... ] )

Parameters 

expression    An expression to be tested against NULL.

At least two expressions must be passed into the function.

Standards and compatibility 

• SQL/92    Transact-SQL extension.

• SQL/99    Vendor extension.

• Sybase    Compatible with Adaptive Server Enterprise, except that Adaptive Server Enterprise allows only two expressions.

See also 

COALESCE function [Miscellaneous]

Example 

The following statement returns the value -66.

SELECT ISNULL( NULL ,-66, 55, 45, NULL, 16 )