COLLATION_CHARACTER_SET_APPLICABILITY

COLLATION_CHARACTER_SET_APPLICABILITY 表将排序规则映射至适用的字符集名称。和 COLLATIONS 表一样,包含此表只是为了兼容 MySQL。

USE INFORMATION_SCHEMA; DESC COLLATION_CHARACTER_SET_APPLICABILITY;

输出结果如下:

+--------------------+-------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------------+-------------+------+------+---------+-------+ | COLLATION_NAME | varchar(32) | NO | | NULL | | | CHARACTER_SET_NAME | varchar(32) | NO | | NULL | | +--------------------+-------------+------+------+---------+-------+ 2 rows in set (0.00 sec)

查看 COLLATION_CHARACTER_SET_APPLICABILITY 表中 utf8mb4 字符集的排序规则映射:

SELECT * FROM COLLATION_CHARACTER_SET_APPLICABILITY WHERE character_set_name='utf8mb4';

输出结果如下:

+--------------------+--------------------+ | COLLATION_NAME | CHARACTER_SET_NAME | +--------------------+--------------------+ | utf8mb4_bin | utf8mb4 | | utf8mb4_general_ci | utf8mb4 | | utf8mb4_unicode_ci | utf8mb4 | +--------------------+--------------------+ 3 rows in set (0.00 sec)

COLLATION_CHARACTER_SET_APPLICABILITY 表中列的含义如下:

  • COLLATION_NAME:排序规则名称
  • CHARACTER_SET_NAME:排序规则所属的字符集名称