Returns the first non-NULL expression from a list. This function is identical to the ISNULL function.

Syntax

COALESCE( expression, expression [ , ...] )

Parameters

Remarks

The result is NULL only if all the arguments are NULL.

The parameters can be of any scalar type, but not necessarily same type.

For a more detailed description of how the database server processes this function, see ISNULL function [Miscellaneous].

See also

• ISNULL function [Miscellaneous]

Standards and compatibility

Example

The following statement returns the value 34.

SELECT COALESCE( NULL, 34, 13, 0 );