NLS - 区域语言支持,用来定义用户所在区域的日期格式,计数方法,货币单位以及语言设置等选项。就比如中国内地的区域设置,见下图。
NLS 技术的使用,可以把货币符号从 $ 转换为 ¥ ,语言从 英文 转成 中文。这样用户就可以使用母语来与 Oracle 进行交互,并且遵循用户的数据显示惯例。
下面的 SQL 实例演示了 NLS 参数的功用。
● 客户端参数(Client Parameters)
可以通过 ALTER SESSION 命令更改此参数
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● 实例参数(Instance Parameters)
可以通过 ALTER SYSTEM 命令更改此参数
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● 数据库参数(Database Parameters)
在数据库的创建过程中进行设置。
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Note:
需要注意,三个参数具有优先级关系,其中 Session Parameters 的优先级
最高,优先启用 Session 级别所设置的参数。
SESSION > INSTANCE > DATABASE