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;
+--------------------+-------------+------+------+---------+-------+ | 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)
SELECT * FROM collation_character_set_applicability WHERE character_set_name='utf8mb4';
+----------------+--------------------+ | COLLATION_NAME | CHARACTER_SET_NAME | +----------------+--------------------+ | utf8mb4_bin | utf8mb4 | +----------------+--------------------+ 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
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