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(mysql.info.gz) Charset-national

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 10.9 National Character Set
 ===========================
 
 Before MySQL 4.1, `NCHAR' and `CHAR' were synonymous. ANSI defines
 `NCHAR' or `NATIONAL CHAR' as a way to indicate that a `CHAR' column
 should use some predefined character set. MySQL 4.1 and up uses `utf8'
 as that predefined character set. For example, these column type
 declarations are equivalent:
 
      CHAR(10) CHARACTER SET utf8
      NATIONAL CHARACTER(10)
      NCHAR(10)
 
 As are these:
 
      VARCHAR(10) CHARACTER SET utf8
      NATIONAL VARCHAR(10)
      NCHAR VARCHAR(10)
      NATIONAL CHARACTER VARYING(10)
      NATIONAL CHAR VARYING(10)
 
 You can use `N'LITERAL'' to create a string in the national character
 set.  These two statements are equivalent:
 
      SELECT N'some text';
      SELECT _utf8'some text';
 
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