2. CHARACTER_SETS

CHARACTER_SETS表提供有关可用字符集的信息。下表中的SHOW Name值对应于SHOW CHARACTER SET语句的列名。

INFORMATION_SCHEMA Name	SHOW Name	Remarks
CHARACTER_SET_NAME	Charset
DEFAULT_COLLATE_NAME	Default collation
DESCRIPTION	Description	MySQL extension
MAXLEN	Maxlen	MySQL extension

表CHARACTER_SETS包含以下列：

CHARACTER_SET_NAME：字符集名称
DEFAULT_COLLATE_NAME：字符集默认排序规则
DESCRIPTION：字符集的描述
MAXLEN：存储一个字符所需的最大字节数。

示例

mysql> SELECT * FROM INFORMATION_SCHEMA.CHARACTER_SETS WHERE CHARACTER_SET_NAME LIKE 'utf8';
+--------------------+----------------------+---------------+--------+
| CHARACTER_SET_NAME | DEFAULT_COLLATE_NAME | DESCRIPTION   | MAXLEN |
+--------------------+----------------------+---------------+--------+
| utf8               | utf8_general_ci      | UTF-8 Unicode |      3 |
+--------------------+----------------------+---------------+--------+
1 row in set (0.00 sec)


mysql> show character set like 'utf8';
+---------+---------------+-------------------+--------+
| Charset | Description   | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
| utf8    | UTF-8 Unicode | utf8_general_ci   |      3 |
+---------+---------------+-------------------+--------+
1 row in set (0.00 sec)