Generate a range of two-character codes

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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
 ('A'),('B'),('C'),('D'),('E'),('F'),('G')
,('H'),('I'),('J'),('K'),('L'),('M'),('N')
,('O'),('P'),('Q'),('R'),('S'),('T'),('U')
,('V'),('W'),('X'),('Y'),('Z');

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

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

Simple, eh?