Oracle MERGE引发ORA-00904错误 [英] Oracle MERGE raise ORA-00904 error

问题描述

我正在使用merge命令将不存在的记录插入表中.当我使用简单的插入命令时，它可以正常工作.如果我使用合并系统，则始终警告ORA-00904:"T"."GROUP_COMPANY_ID"无效的标识符.一旦我将ON条件更改为(1 = 1)强制为true，那么merge命令就可以正常工作了.

I am using merge command to insert a non-exist record into table. When I use simple insert command it works fine. If I use merge system always alert ORA-00904: "T"."GROUP_COMPANY_ID" invalid identifier. Once I change the ON condition to (1=1) to force be true then the merge command works fine.

原始的合并语句出了什么问题?我非常确定该表的创建没有双引号，因此这里没有大小写问题.

What the original merge statement goes to wrong? I am very sure the table was created without double quoted name so there is not case issue here.

create table test
(
  create_date      DATE not null,
  group_company_id CHAR(16) not null
)

-- This is okay
INSERT INTO test (create_date, group_company_id) VALUES (TO_DATE('20100531', 'YYYYMMDD'), 'abc');

-- This one will raise ORA-00904 error
MERGE INTO test T
USING (SELECT 'abc' AS group_company_id FROM DUAL) C
   ON (T.group_company_id = C.group_company_id)
-- ON (1 = 1)
WHEN NOT MATCHED THEN
     INSERT (create_date, group_company_id)
     VALUES (TO_DATE('20100531', 'YYYYMMDD'), 'abc')
WHEN MATCHED THEN
     UPDATE SET group_company_id = 'abc';

推荐答案

使用insert和update子句

WHEN NOT MATCHED THEN
  INSERT (T.create_date, T.group_company_id)
  VALUES (TO_DATE('20100531', 'YYYYMMDD'), 'abc')
WHEN MATCHED THEN
  UPDATE SET T.group_company_id = 'abc'; 

MERGE INTO test  
USING DUAL   
ON (group_company_id = 'abc') 
WHEN NOT MATCHED THEN      
      INSERT VALUES (TO_DATE('20100531', 'YYYYMMDD'), 'abc');

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