COALESCE ( < - value-expression> {,< - value-expression>}... )

The COALESCE function takes a list of expressions (all of which must be of the same type) and returns the first non-null argument from the list. If all of the expressions are null, COALESCE returns null.


Expression Result
COALESCE(‘amy’) amy
COALESCE(‘amy’, null, ‘fred’) amy
COALESCE(null, null, ‘fred’) fred
COALESCE(null, 2, 5) 2