`information_schema.user_mappings.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`user_mappings`
	`authorization_identifier`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER`: 8.4-9.6 `SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported
	`foreign_server_catalog`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER`: 8.4-9.6 `SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported
	`foreign_server_name`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER`: 8.4-9.6 `SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported