Operation
 select.. from.. where 1
 join 1
 group by 1
 order by 1
 union 1
 insert into 1
 update... set 1
 delete 1
 if... elsif... else... end if 1
 case... when... then 1
 loop... end loop 1
 while... loop... end loop 1
 for ... in () loop end loop 1
 continue、exit 1
 return 1
 exception 1
 commit、rollback、execute 1
 alter table 1
 create table 1
 drop table 1
Object
 table 1
 view 1
 function 1
 procedure 1
 trigger 1