sql - 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...下面的代码给了我这个错误。

ORA-00918: 列定义不明确

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

您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);

Answer 2

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

该表D包含与子查询相同的列C，确定该ORIGINATOR列

只需将第二个查询更改为SELECT C.*并仅添加所需的列D。

如何进行故障排除的一般ORA-00918方法是从最里面的子查询运行查询并检查返回的列名是否唯一。

在您的情况下，请先尝试，这应该没问题

  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，您将看到一个或多个带有后缀_1的列，该后缀表示必须排除（对于等值连接谓词中的列）或重命名的重复列。