Шаблон sql r like, так же, как regexp
select DISTINCT(CITY) from STATION where CITY RLIKE '^[^aeiou]' and CITY RLIKE '[^aeiou]$';
Nervous Newt
select DISTINCT(CITY) from STATION where CITY RLIKE '^[^aeiou]' and CITY RLIKE '[^aeiou]$';