Declare function in Oracle SQL temporary script - sql

Question

I have a script that I run in the Toad for Oracle (or in the PL/SQL Developer):
select distinct AC.STATUS, S.DESCRIPTION, count(*) || ' / ' || (
select count(*)
from ACC AC
where AC.STATUS is not null
) "Count"
from ACC AC
join ACC_STATUS S
on AC.STATUS = S.STATUS
group by AC.STATUS, S.DESCRIPTION
order by AC.STATUS;
so it works pretty good and shows me some result like this:
-7 Status 1 30 / 174
-6 Status 2 124 / 174
-3 Status 3 6 / 174
-2 Status 4 4 / 174
-1 Status 5 10 / 174
I want to refactor this and extract the first select (in parentheses) into a function something like:
declare function zz
return number
is
declare res number;
begin
select count(*) into res
from ACC AC
where AC.STATUS is not null;
return res;
end zz;
and then use it somehow in the script.
Is it possible? And which syntax have I use? I do not want to save the function into database – only to run it for my own need in Toad or PL/SQL Developer. (We have Oracle version 12.1.0.2.0.)

Answer 1

In Oracle 12c or above you can utilize WITH factoring clause as
with
function f_test return number is
retval number;
begin
select count(*)
into retval
from acc
where status is not null;
return retval;
end;
select distinct
ac.status,
s.description,
count(*) || ' / ' || f_test
from acc ac join acc_status s on ac.status = s.status
group by ac.status, s.description
order by ac.status;
Otherwise, in lower versions, no - you can't do that and you'll have to create a stored function (the one that exists in the database).

Answer 2

Why? You can just use analytic functions:
select AC.STATUS, S.DESCRIPTION,
count(*) || ' / ' || sum(count(*)) over () as "count"
from ACC AC join
ACC_STATUS S
on AC.STATUS = S.STATUS
group by AC.STATUS, S.DESCRIPTION
order by AC.STATUS;
You don't have to worry about NULL values, because the JOIN filters them out.