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information-schema-character-sets.md

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CHARACTER_SETS
Learn the `CHARACTER_SETS` INFORMATION_SCHEMA table.

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.

See also