Description of the illustration user_defined_function.eps
[ schema. ]
{ [ package. ]function | user_defined_operator }
[ @ dblink. ]
[ ( [ [ DISTINCT | ALL ] expr [, expr ]... ] ) ]
[ schema. ]
{ [ package. ]function | user_defined_operator }
[ @ dblink. ]
[ ( [ [ DISTINCT | ALL ] expr [, expr ]... ] ) ]