information_schema.routines.external_name

Note:

Always NULL.

Note:

If this function is a C function, then the external name (link symbol) of the function; else null. (This works out to be the same value that is shown in routine_definition.)

Note:

If this function is a C function, then the external name (link symbol) of the function; else null. (This works out to be the same value that is shown in routine_definition.)

Note:

Always NULL.

Note:

NULL. Reserved for future use.