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Generate a range of two-character codes

I want to generate a range of auto-incremented characters between two alphanumeric values. For example, AA to BA should generate AA, AB, AC, AD,...BA. Your help in this regard is highly appreciated.

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First of all, these aren't going to be "auto"-incremented. If you're hoping to have the database generate these codes automatically, it's not going to happen. The best you can do is generate these codes yourself. Start by creating a LETTERS table:

create table letters
( letter char(1) not null primary key
insert into letters values

Now you can easily generate any range of codes like this:

select t1.letter||t2.letter
  from letters as t1
  join letters as t2
 where t1.letter||t2.letter
       between 'AA' and 'BA'

Simple, eh?

This was first published in July 2007

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