Question

我跟随我询问我正在尝试运行：

SELECT Script from (

SELECT 9 as ColOrder, ' INSERT INTO PROJ VALUES(' || ID || ',''' || Name || ''', ''' || Version || ''', ''ABCD'', sysdate , ''ABCD'', sysdate);' as Script FROM PROJ where Name like '%[Param.1]%'

union

SELECT 11 as ColOrder,' INSERT INTO PROJMOD VALUES(' || ID || ', ' || ProjID || ', ' || ModID || ', ' || ObjID || ', ''ABCD'', sysdate, ''ABCD'', sysdate);' as Script FROM PROJMOD where ProjID in ( select ID from PROJ where Name like '%[Param.1]%')

) x

Order by ColOrder

但它给了我ORA-12704: character set mismatch error.

当我单独运行select语句时，它给出了正确的输出，但是当我同时选择两个select时，它会给出tme字符集不匹配错误。

这里有什么不妥？

Answer 1

因为你已经确认某些内容是NVARchar ..将nvarchar广播到char，例如

SQL> create table tab(a nvarchar2(2));

Table created.

SQL> insert into tab values ('a');

1 row created.

SQL> select 1, 'hi' from dual
  2  union all
  3  select 2, a from tab;
select 1, 'hi' from dual
          *
ERROR at line 1:
ORA-12704: character set mismatch

失败，因为“A”是NVARCHAR。所以to_char它：

SQL> select 1, 'hi' from dual
  2  union all
  3  select 2, to_char(a) from tab;

         1 'HI'
---------- ----
         1 hi
         2 a

或将字符串文字'hi'强制转换为Nvarchar

   SQL> select 1, n'hi' from dual
      2  union all
      3  select 2, a from tab;

             1 N'
    ---------- --
             1 hi
             2 a

Answer 2

SELECT Script from (

SELECT 9 as ColOrder, ' INSERT INTO PROJ VALUES(' || to_char(ID) || ',''' || to_char(Name) || ''', ''' || to_char(Version) || ''', ''ABCD'', sysdate , ''ABCD'', sysdate);' as Script FROM PROJ where Name like '%[Param.1]%'

union

SELECT 11 as ColOrder,' INSERT INTO PROJMOD VALUES(' || to_char(ID) || ', ' || to_char(ProjID) || ', ' || to_char(ModID) || ', ' || to_char(ObjID) || ', ''ABCD'', sysdate, ''ABCD'', sysdate);' as Script FROM PROJMOD where ProjID in ( select ID from PROJ where Name like '%[Param.1]%')

) x

Order by ColOrder

我刚刚添加了TO_CHAR函数，这将有效。显然你有字段数据类型的字段，不能由Oracle隐式转换，所以你只需要自己明确地转换它，但是要小心避免因转换而导致的任何字符丢失。

Answer 3

如果你犯了这个错误，你应该看看两个条件。

所有表的所有列名或别名必须相同
所有列的类型必须与TableA（col NVARCHAR2），TableB（col NVARCHAR2）

Oracle中的字符集不匹配错误

3 个答案: