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The NLS_CHARSET_ID function returns the character set identification number corresponding to a specified character set name.
Return Value
INTEGER when you specify a valid value for the name of the character set, a number; otherwise NA.
Syntax
NLS_CHARSET_ID (charset_name)
Parameters
A VARCHAR2 text expression that is a valid character set name or one of the following values:
CHAR_CS which specifies that the function return the database character set identification number of the server.
NCHAR_CS which specifies that the function return the national character set id number of the server.