select
trunc(sysdate, 'mi')
- numtodsinterval(mod(EXTRACT(minute FROM cast(sysdate as timestamp)), 10), 'minute')
from dual;
hoặc thậm chí
select
trunc(sysdate, 'mi')
- mod(EXTRACT(minute FROM cast(sysdate as timestamp)), 10) / (24 * 60)
from dual;