Oracleのコンマ区切り値

このようなものかもしれませんか？

with my as (
  select '6,7,99.3334' str
    from dual
)
select 
  regexp_substr(my.str,'[^,]+',1,level) part
from my
connect by level <= length(regexp_replace(my.str,'[^,]+')) + 1
;