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

The return type for this function depends on the expressions specified. That is, when the database server evaluates the function, it first searches for a data type in which all the expressions can be compared. When found, the database server compares the expressions and then returns the result in the type used for the comparison. If the database server cannot find a common comparison type, an error is returned.

• COALESCE function [Miscellaneous]

The following statement returns the value -66.

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