create table 表1( a varchar(100) )
insert into 表1 select '00q000Q00'
insert into 表1 select '00q000q00'
insert into 表1 select '00Q000q00'
go
select *
from 表1
where ascii(substring(a,3,1)) between 97 and 122
and ascii(substring(a,7,1)) between 97 and 122