with tbl as(
select '198845001' hk from dual union all
select '198845002' hk from dual union all
select '198845004' hk from dual union all
select '198945003' hk from dual union all
select '198945004' hk from dual union all
select '198945005' hk from dual union all
select '199045010' hk from dual union all
select '199045011' hk from dual union all
select '199045013' hk from dual union all
select '199145008' hk from dual union all
select '199145009' hk from dual union all
select '199145010' hk from dual union all
select '199245001' hk from dual union all
select '199245005' hk from dual union all
select '199345011' hk from dual union all
select '199345013' hk from dual union all
select '199345015' hk from dual
)
select a.hk1, hk2
  from
     (
       select distinct(substring(hk, 1, 4)) hk1
        from tbl
    where substring(hk, 1, 4) between 1980 and 1989
      )a
      ,
      (
       select distinct(substring(hk, 1, 4)) hk2
        from tbl
    where substring(hk, 1, 4) between 1990 and 1999
      )b;

제가 사용했던 쿼리는 이것인데 이걸로는 이런 데이터가 추출되지 않네요 ㅠ.ㅠ
쿼리로 방법이 있을까요?? (해당 쿼리는 mysql 짜여진 것입니다.)

hk 데이터는 2010년까지 들어있습니다. 2010년까지 다른 쿼리로 아래처럼 결과가 나오게 할 수 있나요??

   hk1         hk2
---------------------
 1988       1990
 1989       1991
 (null)       1992
 (null)       1993