information_schema.schemata.default_character_set_name

mysql

type: VARCHAR NOT NULL
5.7-8

mariadb

type: NULL
Note:
Default character set for the database.
© 2022 MariaDB
5.1-10.8
type: VARCHAR NOT NULL
Note:
Default character set for the database.
© 2022 MariaDB
10.2-10.7

tidb

type: VARCHAR(64) NULL
Note:
The default character set of the database.
© 2022 PingCAP
4-6.1

postgres

type: SQL_IDENTIFIER NULL
Note:
Applies to a feature not available in PostgreSQL
© 1996-2022 The PostgreSQL Global Development Group
10-15
type: SQL_IDENTIFIER
Note:
Applies to a feature not available in PostgreSQL
© 1996-2022 The PostgreSQL Global Development Group
7.4-9.6

cockroachdb

type: unknown
Note:
Always NULL (unsupported by CockroachDB).
© 2022 CockroachDB
1-21.2

mssql

type: SYSNAME NULL
Note:
Returns the name of the default character set.
© Microsoft 2022
aps-pdw-2016-sql-server-ver15