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information-schema-collation-character-set-applicability.md

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COLLATION_CHARACTER_SET_APPLICABILITY
Learn the `COLLATION_CHARACTER_SET_APPLICABILITY` INFORMATION_SCHEMA table.

COLLATION_CHARACTER_SET_APPLICABILITY

The COLLATION_CHARACTER_SET_APPLICABILITY table maps collations to the applicable character set name. Similar to the COLLATIONS table, it is included only for compatibility with MySQL.

USE INFORMATION_SCHEMA;
DESC COLLATION_CHARACTER_SET_APPLICABILITY;

The output is as follows:

+--------------------+-------------+------+------+---------+-------+
| 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)

View the collation mapping for the utf8mb4 character set in the COLLATION_CHARACTER_SET_APPLICABILITY table:

SELECT * FROM COLLATION_CHARACTER_SET_APPLICABILITY WHERE character_set_name='utf8mb4';

The output is as follows:

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

The description of columns in the COLLATION_CHARACTER_SET_APPLICABILITY table is as follows:

  • COLLATION_NAME: The name of the collation.
  • CHARACTER_SET_NAME: The name of the character set which the collation belongs to.