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。

  1. USE information_schema;
  2. DESC collation_character_set_applicability;
  1. +--------------------+-------------+------+------+---------+-------+
  2. | Field              | Type        | Null | Key  | Default | Extra |
  3. +--------------------+-------------+------+------+---------+-------+
  4. | COLLATION_NAME     | varchar(32) | NO   |      | NULL    |       |
  5. | CHARACTER_SET_NAME | varchar(32) | NO   |      | NULL    |       |
  6. +--------------------+-------------+------+------+---------+-------+
  7. 2 rows in set (0.00 sec)
  1. SELECT * FROM collation_character_set_applicability WHERE character_set_name='utf8mb4';
  1. +----------------+--------------------+
  2. | COLLATION_NAME | CHARACTER_SET_NAME |
  3. +----------------+--------------------+
  4. | utf8mb4_bin    | utf8mb4            |
  5. +----------------+--------------------+
  6. 1 row 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