Re: alpha numeric sequences
Date: Tue, 12 Jun 2012 10:55:15 -0400
Message-ID: <CAE-dsOL0mwz2QGX-nUmAx3FEnhuFM_oiPQrzNocBsZhTToACDw_at_mail.gmail.com>
I think I found what I am looking for on the web. I basically want to convert from a base 10 to a base 36 number system. This query below goes from base 36 to base 10. So I need to reverse it. Once I figure out how it works...
Since I already made this thread. Does anyone think there is an easier way to do this? I was hoping to do this? This is not that hard. Since we already have 9 digits of number values already, I can't allow anything that comes back with all digits so I don't get duplicates. So I played to add a to_number() around the query. if I get an exception, that means I have at least 1 character, so I return, if not, I have all digits and I call the function again recursively.
http://stackoverflow.com/questions/2568668/base-36-to-base-10-conversion-using-sql-only
On Tue, Jun 12, 2012 at 10:09 AM, Dba DBA <oracledbaquestions_at_gmail.com>wrote:
> There are alot of posts on the web about this, but I have not seen what I
> am looking for.
> I have a 10 digit field that is populated with a sequence. We are running
> out of numbers. Since we interface with external systems, we were told we
> cannot increase the length of this field. However, we can change it to a
> varchar and make it alpha-numeric. So we can have A-Z, 0-9 in each digit.
> (I don't think we want mixed case. That could be confusing).
>
> So we can have 36 possible characters in each digit.
>
> I am trying to find the easiest way to do this. I would like to base it on
> a sequence as a seed. I tried using to_char to convert to hexadecimal, but
> when I need 11 digits converted, I get a length 11 result back. So this
> isnt work.
>
> select
> to_char(99999999999,'XXXXXXXXX'),length(to_char(9999999999,'XXXXXXXXX'))
> from dual
> /
>
> TO_CHAR(999 LENGTH(TO_CHAR(9999999999,'XXXXXXXXXX'))
> ----------- ----------------------------------------
> 174876E7FF 11
>
> If I do 10 x's I get back a bunch of pounds.
>
> i saw posts on the web using a with clause. And a modulus and the chr
> values. The trick with this is that the capital letters in the alphabet are
> chr 65-90. So when I want digits, i need to use a case statement based on
> the mod I get back. I also thought about
>
> with (123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
>
> and then using a substring based off a module of a sequence value for each
> digit.
> Both of these would request that I use a sys_connect by prior and convert
> each digit.
> There is also the possibility of DBMS_RANDOM and then doing a primary key
> query to check for dupes. Not optimal, but it might work.
>
> I wanted to show that I did spend time trying to figure out how to do
> this. Anyone know the easiest way to do this?
>
-- http://www.freelists.org/webpage/oracle-lReceived on Tue Jun 12 2012 - 09:55:15 CDT