Oracle mathematical functions

Hey guys,
Not sure if this falls under the PL/SQL category or not, but in regards to Oracle's mathematical or numeric functions: i.e. SUM, MIN, MAX, COUNT, etc., does it also do division within a field? I.e. COUNT(*) of one field divided by COUNT(*) with a HAVING or WHERE attatched to it? (or vice versa rather)
In other words, if I have 65 records, and it's maybe a yes-no field, and maybe 43 have the value "yes", for example, can it divide the count total of 43 by 65 to render a percentage value, or does that just need to be handled by whatever supplementary programming language (i.e. java, C++, Perl, etc.) by creating a double or int value and the like?
Forgive me if this seems obvious, as I'm not totally versed in Oracle, but realize it has many capabilities.
Thanks!

Something like this ?
TEST@db102 SQL> select a, b, a/b from
2 (select count(*) a from emp where deptno=30),
3* (select count(*) b from emp)
TEST@db102 SQL> /
         A          B        A/B
         6         14 .428571429
TEST@db102 SQL>
[pre]

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