Question

我尝试在循环中填充表TBL。并在子查询上获取ORA-12704: character set mismatch。这是我使用的查询：

BEGIN
  FOR i IN (SELECT t.Stuff FROM STUFF_TABLE t ORDER BY t.Name ASC)
  LOOP
  INSERT INTO TBL(StuffId, StuffName)
          VALUES(
            i.Stuff,
            (SELECT TempStuffName FROM 
                (SELECT COALESCE(st.StuffName, i.Stuff) as TempStuffName FROM STUFFDEFINITION st WHERE st.Stuff = i.Stuff ORDER BY st.Version DESC)
             WHERE ROWNUM = 1)
          );
  END LOOP;
END;

列类型如下：

STUFF_TABLE.Stuff nvarchar2(30)
TBL.StuffId nvarchar2(30)
TBL.StuffName nvarchar2(50)
STUFFDEFINITION.Stuff varchar2(255)
STUFFDEFINITION.StuffName varchar2(255)

根据我的理解，问题在于类型转换，即从varchar2（255）到nvarchar2（50）。我尝试使用CAST，Translate函数，但它没有帮助。 ORA-12704: character set mismatch仍然存在。

有没有办法在我尝试的时候在循环中填充TBL？

以下是重现问题的测试数据：

CREATE TABLE STUFF_TABLE
(
  Stuff nvarchar2(30),
  Name nvarchar2(50)
);

CREATE TABLE TBL
(
  StuffId nvarchar2(30),
  StuffName nvarchar2(50)
);

CREATE TABLE STUFFDEFINITION
(
  Stuff varchar2(255),
  StuffName varchar2(255),
  Version number(19)
)

INSERT INTO STUFF_TABLE(Stuff, Name) VALUES('First', 'Name1');
INSERT INTO STUFF_TABLE(Stuff, Name) VALUES('Second', 'Name2');
INSERT INTO STUFF_TABLE(Stuff, Name) VALUES('Third', 'Name3');

INSERT INTO STUFFDEFINITION(Stuff, StuffName, Version) VALUES('First', 'First Stuff', 1);
INSERT INTO STUFFDEFINITION(Stuff, StuffName, Version) VALUES('First', 'First Stuff', 2);
INSERT INTO STUFFDEFINITION(Stuff, StuffName, Version) VALUES('Second', 'Second Stuff', 1);
INSERT INTO STUFFDEFINITION(Stuff, StuffName, Version) VALUES('Third', 'Third Stuff', 1);

Answer 1

从您的陈述中可以清楚地看到，您正在使用varchar2加入nvarchar2列，并在varchar2列中插入nvarchar2列。您需要先进行转换。试试这个：

BEGIN
  FOR i IN (SELECT t.Stuff FROM STUFF_TABLE t ORDER BY t.Name ASC)
  LOOP
  INSERT INTO TBL(StuffId, StuffName)
          VALUES(
                 i.Stuff,
                    (SELECT to_nchar(TempStuffName) 
                       FROM 
                        (SELECT COALESCE(to_nchar(st.StuffName), i.Stuff) as TempStuffName 
                         FROM STUFFDEFINITION st 
                         WHERE to_nchar(st.Stuff) = i.Stuff 
                         ORDER BY st.Version DESC)
                     WHERE ROWNUM = 1)
               );
  END LOOP;
END;

Answer 2

您不应该使用PL / SQL：

INSERT INTO TBL ( StuffId, StuffName )
SELECT TO_NCHAR( t.stuff ),
       TO_NCHAR(
         COALESCE(
           MAX( d.StuffName ) KEEP ( DENSE_RANK LAST ORDER BY d.version ),
           t.stuff
         )
       )
FROM   StuffTable t
       LEFT OUTER JOIN StuffDefinition d
       ON ( t.stuff = TO_NCHAR( d.stuff ) )
GROUP BY t.stuff;

Answer 3

Oracle对此错误说：＆＃39; INSERT语句的VALUES子句中的字符串表达式与插入值的列的字符集不同。＆＃39;

请从nls_database_parameters中选择并告诉我它们的值是什么： NLS_CHARACTERSET NLS_NCHAR_CHARACTERSET NLS_RDBMS_VERSION NLS_LENGTH_SEMANTICS

PL / SQL：ORA-12704：将varchar2插入nvarchar2时字符集不匹配

3 个答案: