Any idea on H2 (Oracle MODE) "Syntax error : SELECT NEXTVAL FROM[*] DUAL"?

I was working on h2 with Oracle mode but all the above solutions mentioned above didn't work for me. Although after some research I found that this query will work fine for fetching the next value in the sequence.

select nextval('SchemaName', 'SequenceName');

Please ensure the sequence is created. If it is created, then it works for me:

create sequence SQ_PERSON_ID;
select SQ_PERSON_ID.nextval from dual;

If it is not created, then the same error message is thrown as you got.