`information_schema.collation_character_set_applicability.collation_catalog`

mysql

type: SQL_IDENTIFIER NULL

Note:

Name of the database containing the collation (always the current database)

10-15

type: SQL_IDENTIFIER

Note:

Name of the database containing the collation (always the current database)

9.1-9.6

type: unknown

Note:

Name of the database containing the collation (always the current database).