ORACLE 单列查询变单行显示

SELECT substr(sys_connect_by_path(dutywork, ';'), 2)
  FROM (select dutywork,rownum rn
          from t_test)
 WHERE connect_by_isleaf = 1
 START WITH rn = 1
CONNECT BY prior rn = rn - 1;

查询表t_test的一列，查询出的结果，显示为一行，各个行之间以“;”分割