例：

表

 create table pm_ci
 (ci_id varchar(20) primary key,
  stu_ids varchar(100));

insert into pm_ci values('1','1,2,3,4');
insert into pm_ci values('2','1,4');

 create table pm_stu
 (stu_id varchar(20) primary key,
  stu_name varchar(20));
insert into pm_stu values('1','張三');
insert into pm_stu values('2','李四');
insert into pm_stu values('3','王五');
insert into pm_stu values('4','趙六');
commit;
 

select a.ci_id,b.stu_name
from pm_ci a,pm_stu b
where instr(a.stu_ids,b.stu_id) > 0;

使用oracle wm_concat(column)函式實現：

select ci_id,wm_concat(stu_name) nameslist
from(select a.ci_id,b.stu_name
from pm_ci a,pm_stu b
where instr(a.stu_ids,b.stu_id) > 0)
group by ci_id;