Try a query that looks like:
select LEFT(textvalue, 1) FROM test_table GROUP BY LEFT(textvalue, 1) ORDER BY LEFT(textvalue, 1);
Where textvalue is the name of the column you need the letter from and test_table is the name of the table. I know this works with the latest 3.23, dunno about 3.22 (should upgrade anyway though). Hope that helps.
Chris King