unique admin name3 for AT

number of errors=0
number of warnings=0
country=AT
Group=chkGrpPostalCode

select distinct admincode1,admincode2,admincode3,adminname3 from zip_code where countrycode in ('AT') and admincode1 || admincode2 || admincode3 in (select admincode1 || admincode2 || admincode3 from (select distinct admincode1,admincode2,admincode3,adminname3 from zip_code where countrycode in ('AT')) t group by admincode1,admincode2,admincode3 having count(*)>1) order by admincode1,admincode2,admincode3

http://www.post.at/en/post_subsite_postleitzahlfinder.php?

admincode1	admincode2	admincode3	adminname3