oracle分组后合并其中一个字段

select m.parent_id,

               m.start_date,

               wmsys.wm_concat(m.cleck_name) As name,

               wmsys.wm_concat(m.userId) As userId,

               max(rowid) as rid

          from (select t.parent_id,

                       to_char(t.start_date, 'yyyy-MM-dd') start_date,

                       s.cleck_name,

                       s.user_orderby,

                       t.sche_type,

                       s.id as userId

                  from oa_assistant_schedulerplan t, s_user s

                 where t.user_id = s.id(+)

                   and t.sche_type != '1'

                   and t.parent_id is not null

                 order by s.user_orderby) m
         group by m.parent_id,
m.start_date

按parent_id和start_date分组后合并每个组的cleck_name和userId

另一个实例：

来自http://blog.sina.com.cn/s/blog_56d8ea900100zlwv.html

数据库的结构如下:

no 

   item

01    AA

01    BB

02    CC

02    DD

02    EE

03    FF

04    GG

04    HH

希望将no相同的列整合为一条记录如下

no   items

01   AA,BB

02   CC,DD,EE

03    FF

04   GG,HH

MYSQL中，直接有group_contact函数了，如下：

  select id,group_contact(items) from TABLE group by id

而oracle中，对应的有wm_contact,摘抄例子如下：

select id,wmsys.wm_concat(items) name from table

group by id;