How can I create a random number and letter in a text field...

Hi All,
I am using application express. I want to get a random number and letter for a text field but not sure how to do this. Say I have a licence form and I want to get the licence number automatically when user wants to create a new licence and it needs to be unique. The format I am looking for is - HQ2631 something like this.
I am thinking I have to create a trigger but not sure how to go about this....
advanced thanks,
Tajuddin

Something to play with:
Your method can generate 26 * 26 * 10000 different licence_ids
Generating one million ids takes 20 seconds but produces between 70000 and 80000 duplicates and is rapidly getting worse (if that is something over 7%, doubling the ids generated that grows to something under 30%)
Just see if you can live with that.
select sum(collisions) all_duplicates,count(*) distinct_duplicates,max(collisions) max_multiple
from (select licence_id,count(*) - 1 collisions
          from (select DBMS_RANDOM.STRING('',2) || trunc(DBMS_RANDOM.VALUE(1000,9999)) licence_id
                  from dual
                 connect by level <= :to_generate
         group by licence_id
         having count(*) > 1
       )Regards
Etbin

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Generate random number and letter in a text field ...

Hi All,
I having a bit trouble when trying to generate random number and letter in application express in a text field. Say I have a licence form and when user wants to create a licence, it will provide a random licence number in the licence number field but it has to be unique. the number should be something like HQ2345. I was trying to set the following sql in default value for that text field but it is not working -
select DBMS_RANDOM.STRING('',2) || trunc(DBMS_RANDOM.VALUE(1000,9999))
from dual;
any suggesion !!!!
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