information_schema.user_defined_types.ref_dtd_identifier

mysql

mariadb

tidb

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
9.2-9.6

cockroachdb

mssql