CHARACTER_SETS
CHARACTER_SETS 表提供关于 字符集 的信息。目前，TiDB 仅支持部分字符集。
USE INFORMATION_SCHEMA;
DESC CHARACTER_SETS;输出结果如下：
+----------------------+-------------+------+------+---------+-------+
| 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)查看 CHARACTER_SETS 表：
SELECT * FROM `CHARACTER_SETS`;输出结果如下：
+--------------------+----------------------+-------------------------------------+--------+
| 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)CHARACTER_SETS 表中各列的描述如下：
CHARACTER_SET_NAME：字符集的名称。DEFAULT_COLLATE_NAME：字符集的默认排序规则名称。DESCRIPTION：字符集的描述。MAXLEN：存储该字符集中的一个字符所需的最大长度。