CHARACTER_SETS

The CHARACTER_SETS table provides information about character sets. Currently, TiDB only supports some of the character sets.

USE INFORMATION_SCHEMA; DESC CHARACTER_SETS;

The output is as follows:

+----------------------+-------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------------+-------------+------+------+---------+-------+ | CHARACTER_SET_NAME | varchar(32) | YES | | NULL | | | DEFAULT_COLLATE_NAME | varchar(32) | YES | | NULL | | | DESCRIPTION | varchar(60) | YES | | NULL | | | MAXLEN | bigint(3) | YES | | NULL | | +----------------------+-------------+------+------+---------+-------+ 4 rows in set (0.00 sec)

View the CHARACTER_SETS table:

SELECT * FROM `CHARACTER_SETS`;

The output is as follows:

+--------------------+----------------------+-------------------------------------+--------+ | CHARACTER_SET_NAME | DEFAULT_COLLATE_NAME | DESCRIPTION | MAXLEN | +--------------------+----------------------+-------------------------------------+--------+ | ascii | ascii_bin | US ASCII | 1 | | binary | binary | binary | 1 | | gbk | gbk_chinese_ci | Chinese Internal Code Specification | 2 | | latin1 | latin1_bin | Latin1 | 1 | | utf8 | utf8_bin | UTF-8 Unicode | 3 | | utf8mb4 | utf8mb4_bin | UTF-8 Unicode | 4 | +--------------------+----------------------+-------------------------------------+--------+ 6 rows in set (0.00 sec)

The description of columns in the CHARACTER_SETS table is as follows:

  • CHARACTER_SET_NAME: The name of the character set.
  • DEFAULT_COLLATE_NAME The default collation name of the character set.
  • DESCRIPTION The description of the character set.
  • MAXLEN The maximum length required to store a character in this character set.

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