Question

触发以下查询时出现ORA-00937错误。

查询：

SELECT *
FROM
  (SELECT streetid,
    roadid,
    LISTAGG(longitude ,',') WITHIN GROUP ( ORDER BY sequence_number) long_agg ,
    LISTAGG(latitude ,',')  WITHIN GROUP ( ORDER BY sequence_number) lat_agg ,
    rownum r
  FROM linkstable
  WHERE areaid = 100
 group by strretid,roadid )
WHERE r > 100 AND r < 200;

错误：

 ORA-00937: not a single-group group function
00937. 00000 -  "not a single-group group function"

Answer 1

这是您的查询：

select * 
from (select t.*, rownum as r
      from (select streetid, roadid,
                   LISTAGG(longitude ,',') WITHIN GROUP (ORDER BY sequence_number) as long_agg ,  
                   LISTAGG(latitude ,',') WITHIN GROUP (ORDER BY sequence_number) as lat_agg 
           from  linkstable
           where areaid = 100
          ) t
     ) t
where r > 100  and r <  200;

您使用LISTAGG()作为聚合函数，但没有group by。因此，所有其他列都是无效的，因为它们不是聚合函数的参数。也许你打算：

select * 
from (select streetid, roadid,
             LISTAGG(longitude ,',') WITHIN GROUP (ORDER BY sequence_number) as long_agg ,  
             LISTAGG(latitude ,',') WITHIN GROUP (ORDER BY sequence_number) as lat_agg ,
             rownum r 
      from  linkstable
      where areaid = 100
      group by streetid, roadid
     )
where r > 100  and r <  200;

Answer 2

扩展Gordon的解决方案，使用rownum

的解决方法

WITH street_list as
(
 SELECT streetid,
    roadid,
    LISTAGG(longitude ,',') WITHIN GROUP ( ORDER BY sequence_number) long_agg ,
    LISTAGG(latitude ,',')  WITHIN GROUP ( ORDER BY sequence_number) lat_agg ,
  FROM linkstable
  WHERE areaid = 100
 group by strretid,roadid 
),
street_list_numbered as
(
  SELECT rownum r,streetid,roadid, long_agg,lat_agg 
 FROM street_list
)
SELECT * FROM street_list_numbered
WHERE r > 100  and r <  200;

ORA-00937：使用rownum时不是单组组功能

2 个答案: