SQL
select COL_NAME from TABLE_NAME where COL_NAME in (select COL_NAME from TABLE_NAME group by COL_NAME having count(*) > 1); お好みでdistinctをつけたりしても風流。
select COL_NAME from TABLE_NAME where COL_NAME in (select COL_NAME from TABLE_NAME group by COL_NAME having count(*) > 1); お好みでdistinctをつけたりしても風流。