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10.3.7 The National Character Set

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Standard SQL defines NCHAR or NATIONAL CHAR as a way to indicate that a CHAR column should use some predefined character set. MySQL uses utf8 as this predefined character set. For example, these data type declarations are equivalent:

  1. CHAR(10) CHARACTER SET utf8
  2. NATIONAL CHARACTER(10)
  3. NCHAR(10)

As are these:

  1. VARCHAR(10) CHARACTER SET utf8
  2. NATIONAL VARCHAR(10)
  3. NVARCHAR(10)
  4. NCHAR VARCHAR(10)
  5. NATIONAL CHARACTER VARYING(10)
  6. NATIONAL CHAR VARYING(10)

You can use N'literal' (or n'literal') to create a string in the national character set. These statements are equivalent:

  1. SELECT N'some text';
  2. SELECT n'some text';
  3. SELECT _utf8'some text';

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Document created the 26/06/2006, last modified the 26/10/2018
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