select * from 表 where 字段 collate chinese_prc_cs_as_ws like 'A%' (查大写 )
select * from 表 where 字段 collate chinese_prc_cs_as_ws like 'a%' (查小写 )
--就是在字段名后加 collate chinese_prc_cs_as_ws
SELECT * FROM tablename WHERE (ASCII(SUBSTRING(fieldname, 1, 1)) > 64) AND (ASCII(SUBSTRING(fieldname, 1, 1)) < 91)
where substring(field,1,1) between 'A" and 'Z'