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10.3.4 Table Character Set and Collation

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Every table has a table character set and a table collation. The CREATE TABLE and ALTER TABLE statements have optional clauses for specifying the table character set and collation:

  1. CREATE TABLE tbl_name (column_list)
  2.     [[DEFAULT] CHARACTER SET charset_name]
  3.     [COLLATE collation_name]]
  4.  
  5. ALTER TABLE tbl_name
  6.     [[DEFAULT] CHARACTER SET charset_name]
  7.     [COLLATE collation_name]

Example:

  1. CREATE TABLE t1 ( ... )
  2. CHARACTER SET latin1 COLLATE latin1_danish_ci;

MySQL chooses the table character set and collation in the following manner:

  • If both CHARACTER SET charset_name and COLLATE collation_name are specified, character set charset_name and collation collation_name are used.

  • If CHARACTER SET charset_name is specified without COLLATE, character set charset_name and its default collation are used. To see the default collation for each character set, use the SHOW CHARACTER SET statement or query the INFORMATION_SCHEMA CHARACTER_SETS table.

  • If COLLATE collation_name is specified without CHARACTER SET, the character set associated with collation_name and collation collation_name are used.

  • Otherwise (neither CHARACTER SET nor COLLATE is specified), the database character set and collation are used.

The table character set and collation are used as default values for column definitions if the column character set and collation are not specified in individual column definitions. The table character set and collation are MySQL extensions; there are no such things in standard SQL.


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