Demonstrate Oracle temporary tables

drop table x
/

create global temporary table x (a date)
        on commit delete rows     -- Delete rows after commit
        -- on commit preserve rows   -- Delete rows after exit session
/

select table_name, temporary, duration
from   user_tables
where  table_name = 'X'
/

insert into x values (sysdate);

select * from x;

commit;

-- Inserted rows are missing after commit
select * from x;