运行合并到查询时出现 ORA-30926 错误答案

【问题标题】：ORA-30926 error when running the merge into query运行合并到查询时出现 ORA-30926 错误
【发布时间】：2011-05-03 21:30:55
【问题描述】：

我收到此查询错误：

 MERGE INTO edw_clctns_equip_dim d
   USING psa_equipment_status_history
      ON ( dw_equipment_id = TO_NUMBER (d.clctns_equip_source_id)
           AND d.active_ind = 'Y')
 WHEN MATCHED THEN
  UPDATE
     SET clctns_initial_status_date =
            (SELECT MIN (effective_date)
               FROM psa_equipment_status_history
              WHERE dw_equip_status_type_id IN (
                                       SELECT dw_equip_status_type_id
                                         FROM psa_equipment_status_type
                                        WHERE equipment_status_code = '100')
                AND current_flag = 'Y'
                AND iud_flag <> 'D'
                AND dw_equipment_id = TO_NUMBER (d.clctns_equip_source_id))

我可以使用简单的更新查询，但耗时太长。合并语句有帮助吗？

Update EDW_CLCTNS_EQUIP_DIM d
Set CLCTNS_INITIAL_STATUS_DATE =
( SELECT 
    MIN(EFFECTIVE_DATE)
  FROM PSA_EQUIPMENT_STATUS_HISTORY
  WHERE DW_EQUIP_STATUS_TYPE_ID In
  ( Select DW_EQUIP_STATUS_TYPE_ID
    From PSA_EQUIPMENT_STATUS_TYPE
    Where EQUIPMENT_STATUS_CODE = '100'
  )
  AND CURRENT_FLAG = 'Y' 
  AND IUD_FLAG<>'D'
  AND DW_EQUIPMENT_ID=to_number(d.CLCTNS_EQUIP_SOURCE_ID)
);

【问题讨论】：

你查看ORA-30926: unable to get a stable set of rows in the source tables的答案了吗？
psa_equipment_status_history 表包含多个条目，因此出现错误

标签： sql oracle merge

【解决方案1】：

是的，很抱歉发布这个问题，我只检查目标表而不是源表

merge 
into EDW_CLCTNS_EQUIP_DIM d
using 
(
SELECT 
MIN(EFFECTIVE_DATE) as STATUS_DATE,DW_EQUIPMENT_ID
FROM PSA_EQUIPMENT_STATUS_HISTORY
WHERE DW_EQUIP_STATUS_TYPE_ID  in (select DW_EQUIP_STATUS_TYPE_ID from PSA_EQUIPMENT_STATUS_TYPE where EQUIPMENT_STATUS_CODE = '100')  AND 
CURRENT_FLAG = 'Y' 
AND IUD_FLAG<>'D'
group by DW_EQUIPMENT_ID
) a
on (d.CLCTNS_EQUIP_SOURCE_ID=to_char(a.DW_EQUIPMENT_ID) and d.ACTIVE_IND='Y')
WHEN MATCHED
THEN
UPDATE
SET CLCTNS_INITIAL_STATUS_DATE = a.STATUS_DATE;

【讨论】：

【解决方案2】：

看看ORA-30926: unable to get a stable set of rows in the source tables的答案：

这通常是由于在 USING 子句中指定的查询重复造成的。
...

_{由于我的评论似乎已经解决了您的问题，所以我将其发布为答案。}

【讨论】：