Select a range of alphanumeric values

Question

hi,
i have a column with values like this:
001A45
124323
V1234C
these values have a theoretical order.
numbers have higher priority than chars.
the ranking of the chars is like: A = 1, ... , Z = 26.
is there a possibility to select an alphanumerical range in oracle?
thanks a lot!

Answer 1

Do you mean something like this?
SQL> ed
Wrote file afiedt.buf
  1  with t as (select '001A45' as txt from dual union all
  2             select '124323' from dual union all
  3             select 'V1234C' from dual)
  4  -- END OF TEST DATA
  5  select txt, replace(sys_connect_by_path(case when ascii(ch) between ascii('A') and ascii ('Z') then to_char(ascii(ch)-64,'fm09') else to_char(ascii(ch),'fm09') end,','),',') as ord
  6  from (
  7        select txt, rn, ch
  8        from (
  9              select txt, row_number() over (partition by txt order by rn) as rn, substr(txt,rn,1) as ch
10              from t, (select rownum as rn from dual connect by rownum <= (select max(length(txt)) from t))
11             )
12        where ch is not null
13       )
14  where connect_by_isleaf = 1
15  connect by txt = prior txt and rn = prior rn + 1
16  start with rn = 1
17* order by 2
SQL> /
TXT    ORD
V1234C 224950515203
001A45 484849015253
124323 495052515051
SQL>I've displayed the ORD column (the one being ordered on) so you can see how each character, whether alpha or numeric is converted to an ascii equivalent, but with the alphas being assigned the values 1 thru 26 whereas the numbers have their natural ascii values 48 thru 57
You can change that as you require if it's not quite what you mean.