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Arredondar data para intervalo de 10 minutos

select
  trunc(sysdate, 'mi')
  - numtodsinterval(mod(EXTRACT(minute FROM cast(sysdate as timestamp)), 10), 'minute')
from dual;

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