`information_schema.sql_features.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`sql_features`
	`comments`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `CHARACTER_DATA NULL`: 10-15	unsupported	unsupported
	`feature_id`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `CHARACTER_DATA NULL`: 10-15	unsupported	unsupported
	`feature_name`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `CHARACTER_DATA NULL`: 10-15	unsupported	unsupported
	`is_supported`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `YES_OR_NO NULL`: 10-15	unsupported	unsupported
	`is_verified_by`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `CHARACTER_DATA NULL`: 10-15	unsupported	unsupported
	`sub_feature_id`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `CHARACTER_DATA NULL`: 10-15	unsupported	unsupported
	`sub_feature_name`	unsupported	unsupported	unsupported	`CHARACTER_DATA`: 7.4-9.6 `CHARACTER_DATA NULL`: 10-15	unsupported	unsupported