Oracle中的字符集不匹配错误

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.

当我单独运行两个select语句时,它给了我正确的输出但是当我同时进行两个select的并集时,它给出了tme字符集不匹配错误.

这可能有什么不对？

Answer 1

因为你已经确认了某些东西是NVARchar的...将nvarchar转换为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

或者将字符串文字'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，这将起作用。显然，您的字段具有 Oracle 无法隐式转换的字符数据类型，因此您只需要自己显式转换它，但要小心避免因转换而丢失任何字符。