information_schema.referential_constraints.constraint_schema

mysql

type: VARCHAR NOT NULL
5.7-8

mariadb

type: NULL
Note:
Database name, together with CONSTRAINT_NAME identifies the foreign key.
© 2022 MariaDB
5.1-10.8
type: VARCHAR NOT NULL
Note:
Database name, together with CONSTRAINT_NAME identifies the foreign key.
© 2022 MariaDB
10.2-10.7

tidb

postgres

type: SQL_IDENTIFIER NULL
Note:
Name of the schema containing the constraint
© 1996-2022 The PostgreSQL Global Development Group
10-15
type: SQL_IDENTIFIER
Note:
Name of the schema containing the constraint
© 1996-2022 The PostgreSQL Global Development Group
7.4-9.6

cockroachdb

type: unknown
Note:
Name of the schema containing the constraint.
© 2022 CockroachDB
2-21.2

mssql

type: NVARCHAR(128) NULL
Note:
Name of schema that contains the constraint. ** Important ** Do not use INFORMATION_SCHEMA views to determine the schema of an object. INFORMATION_SCHEMA views only represent a subset of the metadata of an object. The only reliable way to find the schema of a object is to query the sys.objects catalog view.
© Microsoft 2022
azuresqldb-current-sql-server-ver15