Insert statement with a single value und missing parantheses after the VALUES keyword
The following insert statement lacks the parantheses after the values keyword and throws ORA-03001: unimplemented feature:
create table tq84_ora_03001 (num number, txt varchar2(22));
insert into tq84_ora_03001 (num) values 42;
drop table tq84_ora_03001;
Misc
The ORA-03001 error might be thrown by executing alter session reset statistics_level;.
Note, that alter system reset statistics_level; does not throw this error.