5

我正在通过 ODBC 和水晶报告 2008 使用 oracle 11(不确定确切的版本,但由于 LISTAGG 不起作用,我想它不是版本 2)。

这是我遇到的问题:

这是一张表:

TABLE ODB.TASK_CARD_CONTROL  
------------------------------------------  
task_card     control_category     code  
------------------------------------------  
1                  zone             17  
1                  zone             33  
1                  zone             21  
2                  zone             18  
2                  zone             05  
3                  zone             55  
3                  zone             32  
3                  zone             72 

我正在使用 WM_CONCAT 函数来获得这样的东西:

task_card      zones
1              17,33,21
2              18,05
3              55,32,72

这是用于此的 SQL:

SELECT TASK_CARD, WM_CONCAT(code) as ZONES
FROM ODB.TASK_CARD_CONTROL
WHERE ODB.TASK_CARD_CONTROL.CONTROL_CATEGORY = 'ZONE'
GROUP BY TASK_CARD

但我希望对区域进行排序,所以我尝试了这个:

SELECT TASK_CARD, WM_CONCAT(code) as ZONES
FROM (SELECT TASK_CARD, CODE, CONTROL_CATEGORY FROM ODB.TASK_CARD_CONTROL 
ORDER BY CODE)
WHERE ODB.TASK_CARD_CONTROL.CONTROL_CATEGORY = 'ZONE'
GROUP BY TASK_CARD

但由于某种原因,它返回以下错误:

Failed to retrieve data from the database.
Details: 42S22:[Oracle][ODBC][Ora]ORA-00904: 
"ODB"."TASK_CARD_CONTROL"."CONTROL_CATEGORY" : invalid identifier

我真的不明白我在这里做错了什么......有人可以给我一个提示吗?

4

6 回答 6

6

对于仍在使用 wm_CONCAT(又名较旧的数据库版本)的任何人:解决方案是添加不同的条件,然后它还将对连接的值应用升序。

不要问为什么它没有记录在案,但它会起作用。

此外,在 wm_concat 之前的子查询中使用 order by 只会随机化顺序,因此不应该推荐它。

请求的 SQL 示例:

SELECT TASK_CARD, WM_CONCAT(distinct code) as ZONES
FROM ODB.TASK_CARD_CONTROL
WHERE ODB.TASK_CARD_CONTROL.CONTROL_CATEGORY = 'ZONE'
GROUP BY TASK_CARD;

请注意, distinct 选项在 procedure/packages 中使用时不起作用。

于 2014-10-21T12:15:16.700 回答
2

您不能从内部查询外部引用 ODB.TASK_CARD_CONTROL.CONTROL_CATEGORY。尝试:

SELECT TASK_CARD, WM_CONCAT(code) as ZONES
FROM (SELECT TASK_CARD, CODE, CONTROL_CATEGORY FROM ODB.TASK_CARD_CONTROL 
      WHERE ODB.TASK_CARD_CONTROL.CONTROL_CATEGORY = 'ZONE'
      ORDER BY CODE)
GROUP BY TASK_CARD
于 2011-02-11T15:11:35.790 回答
0

如果在 from 子句中为子查询命名,则可以引用子查询本身中的列

SELECT t1.TASK_CARD
, WM_CONCAT(t1.code) as ZONES
FROM 
(SELECT TASK_CARD, CODE, CONTROL_CATEGORY FROM ODB.TASK_CARD_CONTROL ORDER BY CODE) t1
WHERE t1.CONTROL_CATEGORY = 'ZONE'
GROUP BY t1.TASK_CARD
于 2012-05-28T13:46:48.980 回答
0
  1. 按所需列排序,然后
  2. 按行号按外部查询顺序排列。
  3. 使用该功能。

此函数具有最后一个 rownum 顺序的逻辑:

Select wmsys.wm_concat(t) CONCAT from 
(
    Select t from (
        Select t from (
            Select 'aa' t from dual
            union
            Select 'zz' t from dual
            union
            Select 'pp' t from dual
            union
            Select 'll' t from dual
            union
            Select 'mm' t from dual
            union
            Select 'xx' t from dual
            union
            Select 'cc' t from dual
        ) a 
        order by t
    ) order by rownum
) t
于 2015-08-26T18:52:18.187 回答
0

LISTAGG是在11g 第 2 版中引入的。

因此,在不支持11g 之前的 Oracle 版本中,您可以使用ROW_NUMBER()SYS_CONNECT_BY_PATH函数。LISTAGG

请参阅Oracle 字符串聚合技术

SELECT task_card,
  LTRIM(MAX(SYS_CONNECT_BY_PATH(code,','))
  KEEP (DENSE_RANK LAST ORDER BY curr),',') AS zones
  FROM   (SELECT task_card,
                code,
                ROW_NUMBER() OVER (PARTITION BY fruit ORDER BY code) AS curr,
                ROW_NUMBER() OVER (PARTITION BY fruit ORDER BY code) -1 AS prev
         FROM   table_name)
  GROUP BY task_card
  CONNECT BY prev = PRIOR curr AND task_card= PRIOR task_card
 START WITH curr = 1;

笔记

永远不要使用WM_CONCAT,因为它是一个未记录的功能,并且已从 12c 版本中删除。

任何一直依赖wm_concat功能的应用程序一旦升级到12c. 从那以后,它已被删除。请参阅为什么不在 Oracle 中使用 WM_CONCAT 函数?

SQL> select banner from v$version where rownum = 1;

BANNER
----------------------------------------------------------------------------
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production

SQL> SELECT object_name
  2  FROM dba_objects
  3  WHERE owner='WMSYS'
  4  AND object_name LIKE 'WM\_%' ESCAPE '\';

OBJECT_NAME
----------------------------------------------------------------------------
WM_REPLICATION_INFO
WM_RDIFF
WM_PERIOD
WM_PERIOD
WM_OVERLAPS
WM_MEETS
WM_LESSTHAN
WM_LDIFF
WM_INTERSECTION
WM_INSTALLATION
WM_GREATERTHAN
WM_EVENTS_INFO
WM_ERROR
WM_ERROR
WM_EQUALS
WM_DDL_UTIL
WM_DDL_UTIL
WM_CONTAINS
WM_COMPRESS_BATCH_SIZES
WM_COMPRESSIBLE_TABLES

20 rows selected.

SQL>

您将收到“<strong>invalid identifier”错误:

SQL> SELECT banner FROM v$version;

BANNER
----------------------------------------------------------------------------
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
PL/SQL Release 12.1.0.1.0 - Production
CORE    12.1.0.1.0      Production
TNS for 64-bit Windows: Version 12.1.0.1.0 - Production
NLSRTL Version 12.1.0.1.0 - Production

SQL> SELECT deptno, wm_concat(ename) FROM emp;
SELECT deptno, wm_concat(ename) FROM emp
               *
ERROR at line 1:
ORA-00904: "WM_CONCAT": invalid identifier

因此,没有必要依赖最新版本中不再提供的未记录功能。

于 2015-09-11T16:27:43.187 回答
-1

使用 ListAgg 代替 wm_concat

SELECT TASK_CARD, ListAgg(code) within (order by code asc) as ZONES

http://nimishgarg.blogspot.com/2010/07/oracle-differece-between-wmconcat-and.html

于 2012-03-16T08:41:05.533 回答