ORA-12704: character set mismatch

Question

Hell when I do:

select COALESCE (CORP_ID, 0) from crmuser.accounts;

The CORP_ID records which are Null returns 0 but when I do:

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Answer 1

This generic fix works with columns defined as either VARCHAR2 or NVARCHAR2:

select COALESCE (EMAIL, N'' || 'NO EMAIL') from crmuser.accounts

Just add N'' || before your non-Unicode string constant.