`information_schema._pg_user_mappings.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`_pg_user_mappings`
	`authorization_identifier`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported
	`foreign_server_catalog`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported
	`foreign_server_name`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported
	`oid`	unsupported	unsupported	unsupported	`OID NULL`: 10-15	unsupported	unsupported
	`srvowner`	unsupported	unsupported	unsupported	`SQL_IDENTIFIER NULL`: 10-15	unsupported	unsupported
	`umoptions`	unsupported	unsupported	unsupported	`ARRAY NULL`: 10-15	unsupported	unsupported
	`umuser`	unsupported	unsupported	unsupported	`OID NULL`: 10-15	unsupported	unsupported