ORA-12704：Oracle中的字符集与nvarchar2数据类型不匹配

Question

我使用以下查询获取错误代码ORA-12704：

SELECT COALESCE(BankDetails.description,'') as description FROM BankDetails

描述列nvarchar2的数据类型。我假设''是问题的原因，因为这与数据类型不匹配。

Answer 1

试试这个

SELECT COALESCE(BankDetails.description,n'') as description FROM BankDetails

参考

ORA-12704: character set mismatch

Answer 2

您应该使用n变体将''转换为nvarchar：

SELECT COALESCE(BankDetails.description,n'') as description FROM BankDetails

Answer 3

或者你可以使用这个：

SELECT COALESCE(BankDetails.description, NULL) as description FROM BankDetails