例:
1.SELECT DISTINCT CONCAT(CORP_KEY,'_',CREATED_TIME) FROM corp_info
2.SELECT DISTINCT CONCAT_WS('_',生年月日,年齢) FROM person_info
3.person_info から DISTINCT GROUP_CONCAT(生年月日) を選択します
例:
1.SELECT DISTINCT CONCAT(CORP_KEY,'_',CREATED_TIME) FROM corp_info
2.SELECT DISTINCT CONCAT_WS('_',生年月日,年齢) FROM person_info
3.person_info から DISTINCT GROUP_CONCAT(生年月日) を選択します