NLS_CHARACTERSET和NLS_NCHAR_CHARACTERSET

The NLS_CHARACTERSET is used for CHAR, VARCHAR2, LONG and CLOB columns;
The NLS_NCHAR_CHARACTERSET is used for NCHAR, NVARCHAR2 and NCLOB columns.
From 9i onwards the NLS_NCHAR_CHARACTERSET can have only 2 values: UTF8 or AL16UTF16 who are Unicode charactersets

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原文地址：https://www.cnblogs.com/KevinJasmine/p/4894887.html