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IS [NOT] NULL
SQL Server 2000
Determines whether or not a given expression is NULL.
Syntax
expression IS [ NOT ] NULL
Arguments
- expression
- Is any valid expression in Microsoft® SQL Server™ 2000 Windows® CE Edition (SQL Server CE).
- NOT
- Specifies that the Boolean result be negated. The predicate reverses its return values, returning TRUE if the value is NOT NULL, and FALSE if the value is NULL.
Result Types
bit
Return Code Values
If the value of expression is NULL, IS NULL returns TRUE; otherwise, it returns FALSE.
If the value of expression is NULL, IS NOT NULL returns FALSE; otherwise, it returns TRUE.
Remarks
To determine whether an expression is NULL, use IS NULL or IS NOT NULL rather than comparison operators (such as = or !=). Comparison operators return UNKNOWN if either or both arguments are NULL.
