Oracle 错误：ORA-00905：缺少关键字

Posted 2023-05-09

【中文标题】Oracle 错误：ORA-00905：缺少关键字

【英文标题】：Oracle error : ORA- 00905 : Missing keyword

【发布时间】：2021-12-03 05:25:33

【问题描述】：

我正在执行这条 SQL 语句：

MERGE INTO INTERVIEW OLD_R
USING NEW_INTERVIEW NEW_R
ON (NEW_R.REG_NO = OLD_R.REG_NO)
WHEN MATCHED
    AND (NEW_R.NAME <> OLD_R.NAME OR NEW_R.MOB_NO <> OLD_R.MOB_NO)
THEN UPDATE SET 
    OLD_R.NAME = NEW_R.NAME,
    OLD_R.MOB_NO = NEW_R.MOB_NO
WHEN NOT MATCHED BY OLD_R 
THEN 
     INSERT(OLD_R.NAME, OLD_R.REG_NO, OLD_R.MOB_NO)
     VALUES(NEW_R.NAME, NEW_R.REG_NO, NEW_R.MOB_NO)
WHEN NOT MATCHED BY NEW_R
THEN DELETE;

针对 Oracle 数据库备份名为 assignment 的表，但出现此错误：

ORA-00905：缺少关键字

【参考方案1】：

语法错误。应该是

MERGE INTO INTERVIEW OLD_R
     USING NEW_INTERVIEW NEW_R
        ON (NEW_R.REG_NO = OLD_R.REG_NO)
WHEN MATCHED
THEN
   UPDATE SET OLD_R.NAME = NEW_R.NAME, OLD_R.MOB_NO = NEW_R.MOB_NO
           WHERE    NEW_R.NAME <> OLD_R.NAME
                 OR NEW_R.MOB_NO <> OLD_R.MOB_NO
WHEN NOT MATCHED
THEN
   INSERT     (OLD_R.NAME, OLD_R.REG_NO, OLD_R.MOB_NO)
       VALUES (NEW_R.NAME, NEW_R.REG_NO, NEW_R.MOB_NO);

【参考方案2】：

WHEN MATCHED
   AND (NEW_R.NAME <> OLD_R.NAME OR NEW_R.MOB_NO <> OLD_R.MOB_NO)
THEN UPDATE SET 
    OLD_R.NAME = NEW_R.NAME,
    OLD_R.MOB_NO = NEW_R.MOB_NO

应该是

WHEN MATCHED THEN
  UPDATE
  SET   OLD_R.NAME = NEW_R.NAME,
        OLD_R.MOB_NO = NEW_R.MOB_NO
  WHERE NEW_R.NAME <> OLD_R.NAME OR NEW_R.MOB_NO <> OLD_R.MOB_NO

然后

WHEN NOT MATCHED BY OLD_R 

应该是：

WHEN NOT MATCHED

和：

WHEN NOT MATCHED BY NEW_R
THEN DELETE;

不是 Oracle 支持的语法；您需要使用单独的 DELETE 语句删除这些行。