oracle 行转列问题

 select id,
        name,
        sum(decode(tag_name, 'AAA', nvl(value, 0),'BBB' ,nvl(value, 0),0)) "imp_value",
        sum(decode(tag_name, 'C01', nvl(value, 0),'D01', nvl(value, 0), 0)) "click_value"

   from (SELECT a.id, a.name, d.tag_name, d.value
           FROM A a
           LEFT JOIN B b
             ON a.id = b.id
           left join d d
             on b.imp_url = d.tag_name
         union
         SELECT a.id, a.name, d.tag_name, d.value
           FROM A a
           LEFT JOIN C c
             ON a.id = c.id
           left join d d
             on c.click_url = d.tag_name) m
  group by id, name

下面是根据id和name 将value合并成一列

 select id,
        name,
        to_char(WMSYS.WM_CONCAT(tag_name)) tag_name,
        to_char(WMSYS.WM_CONCAT(value)) value
   from (SELECT a.id, a.name, d.tag_name, d.value
           FROM A a
           LEFT JOIN B b
             ON a.id = b.id
           left join d d
             on b.imp_url = d.tag_name
         union
         SELECT a.id, a.name, d.tag_name, d.value
           FROM A a
           LEFT JOIN C c
             ON a.id = c.id
           left join d d
             on c.click_url = d.tag_name) m
  group by id, name