如何修复此 SQL 代码中的 ORA-00918 错误

Question

我的代码有 ORA-00918 错误，我找不到问题...以下代码给出了这个错误。

ORA-00918 : column ambiguously defined

谁能给我一些建议？谢谢

SELECT * FROM (
 SELECT * FROM (
  SELECT ROWNUM AS RNUM, A.XML_MSG_ID, A.LOGIN_ID, A.ORIGINATOR, A.RECIPIENT, A.ERROR_CODE, B.DOC_NO, B.DOC_NAME, B.ERROR_MSG
  FROM XML_MANAGE_TBL A, XML_REFERENCE_TBL B
  WHERE A.XML_MGS_ID = B.XML_MSG_ID
   AND A.ERROR_CODE <> '00000000'
   AND A.XML_MSG_ID >= '20190528' AND (SUBSTR(A.XML_MSG_ID, 1, 8)) <= '20190604' ) C, EBILL_USER D WHERE D.COMP_NUM = '1258169573' AND C.ORIGINATOR = D.ORIGINATOR )
 WHERE RNUM BETWEEN CASE WHEN (1-1) != 0 THEN ((1-1)*50)+1 ELSE (1-1)*50 END
 AND 1*50;

Answer 1

问题很可能在第二个子查询中 select *

SELECT * FROM (
  ... subquery C ...
) C, EBILL_USER D WHERE ... AND C.ORIGINATOR = D.ORIGINATOR

table D 包含与子查询 C 相同的列，当然 ORIGINATOR 列

简单地将第二个查询更改为 SELECT C.* 并仅添加 D.

中的所需列

一般方法如何解决ORA-00918是运行来自最内层子查询的查询并检查返回的列名是否唯一。

你的情况先试试，应该没问题

  SELECT ROWNUM AS RNUM, A.XML_MSG_ID, A.LOGIN_ID, A.ORIGINATOR, A.RECIPIENT, A.ERROR_CODE, B.DOC_NO, B.DOC_NAME, B.ERROR_MSG
  FROM XML_MANAGE_TBL A, XML_REFERENCE_TBL B
  WHERE A.XML_MGS_ID = B.XML_MSG_ID
   AND A.ERROR_CODE <> '00000000'
   AND A.XML_MSG_ID >= '20190528' AND (SUBSTR(A.XML_MSG_ID, 1, 8)) <= '20190604'

比运行第二个最里面的子查询

SELECT * FROM (
  SELECT ROWNUM AS RNUM, A.XML_MSG_ID, A.LOGIN_ID, A.ORIGINATOR, A.RECIPIENT, A.ERROR_CODE, B.DOC_NO, B.DOC_NAME, B.ERROR_MSG
  FROM XML_MANAGE_TBL A, XML_REFERENCE_TBL B
  WHERE A.XML_MGS_ID = B.XML_MSG_ID
   AND A.ERROR_CODE <> '00000000'
   AND A.XML_MSG_ID >= '20190528' AND (SUBSTR(A.XML_MSG_ID, 1, 8)) <= '20190604' ) C, EBILL_USER D WHERE D.COMP_NUM = '1258169573' AND C.ORIGINATOR = D.ORIGINATOR

在您的 IDE（例如 SQL Developer）中，您会看到一个或多个带有后缀 _1 的列，这是必须排除的重复列的标志（对于列来自 equijoin 谓词）或重命名。

Answer 2

你只需要删除最外层的查询并在 where 子句中使用 C.RNUM 而不是 RNUM。试试下面的代码：

SELECT * FROM (
  SELECT ROWNUM AS RNUM, A.XML_MSG_ID, A.LOGIN_ID, A.ORIGINATOR, A.RECIPIENT, A.ERROR_CODE, B.DOC_NO, B.DOC_NAME, B.ERROR_MSG
  FROM XML_MANAGE_TBL A, XML_REFERENCE_TBL B
  WHERE A.XML_MGS_ID = B.XML_MSG_ID
   AND A.ERROR_CODE <> '00000000'
   AND A.XML_MSG_ID >= '20190528' AND (SUBSTR(A.XML_MSG_ID, 1, 8)) <= '20190604' ) C, EBILL_USER D WHERE D.COMP_NUM = '1258169573' AND C.ORIGINATOR = D.ORIGINATOR
  and (C.RNUM BETWEEN CASE WHEN (1-1) != 0 THEN ((1-1)*50)+1 ELSE (1-1)*50 END AND 1*50);

如何修复此 SQL 代码中的 ORA-00918 错误

How to fix this ORA-00918 error in this SQL code

sql

database

oracle

ora-00918