行列转换

Oracle11.2新特性之listagg函数 （行列转换）

作为聚集函数
SELECT deptno,LISTAGG(ename, ',') WITHIN GROUP(ORDER BY ename) AS employees
FROM scott.emp
GROUP BY deptno;

多表
select jzg.tid,
       jzg.firstname,
       listagg(d.dwmc, ',') within group(order by d.dwmc) aa
  from xtgl_jzg jzg, xtgl_yhdwgxb gx, xtgl_depart d
 where jzg.tid = gx.yhbh(+)
   and gx.dwh = d.dwdm(+)
 GROUP BY jzg.tid, jzg.firstname

 

多表,及表中存在blob类型字段,自关联

select x.*, j.aa
  from (select jzg.tid,
               jzg.firstname,
               listagg(d.dwmc, ',') within group(order by d.dwmc) aa
          from xtgl_jzg jzg, xtgl_yhdwgxb gx, xtgl_depart d
         where jzg.tid = gx.yhbh(+)
           and gx.dwh = d.dwdm(+)
         GROUP BY jzg.tid, jzg.firstname) j,
       xtgl_jzg x
 where j.tid = x.tid
 order by x.tid

 --摘自 移动IM接口的用户管理