ORA-38104: Columns referenced in the ON Clause cannot be updated: "U"."USER_ID"

在用merge语句更新一个表的时候报错：

SQL> merge into OUTSITE_USERINFO u

  2      using tmp_update_newlib ut

  3      on (u.user_id = ut.NEWCOURSE_ID)

  4      when matched then

  5      update set u.user_id = ut.NEWLIB_ID;

    on (u.user_id = ut.NEWCOURSE_ID)

        *

ERROR at line 3:

ORA-38104: Columns referenced in the ON Clause cannot be updated: "U"."USER_ID"

看错误意思大概是不能更新on条件引用的列

查看官方文档，确实如此：

merge_update_clause
Restrictions on the merge_update_clause This
clause is subject to the following restrictions:

You cannot update a column that is referenced in the 

ON

 

condition

 clause.

这种情况可以用update语句去更新
SQL> update OUTSITE_USERINFO set user_id=(select NEWLIB_ID from tmp_update_newlib where OUTSITE_USERINFO.user_id=tmp_update_newlib.N

EWCOURSE_ID)

  2  where user_id in (select OUTSITE_USERINFO.user_id from OUTSITE_USERINFO,tmp_update_newlib where OUTSITE_USERINFO.user_id=tmp_up

date_newlib.NEWCOURSE_ID);

1 row updated.

记录一下。