TABLE_CONSTRAINTS (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns one row for each table constraint in the current database. This information schema view returns information about the objects to which the current user has permissions.
To retrieve information from these views, specify the fully qualified name of INFORMATION_SCHEMA.view_name.
| Column name | Data type | Description |
|---|---|---|
| CONSTRAINT_CATALOG | nvarchar(128) | Constraint qualifier. |
| CONSTRAINT_SCHEMA | nvarchar(128) | Name of schema that contains the constraint. Important: The only reliable way to find the schema of an object is to query the sys.objects catalog view. |
| CONSTRAINT_NAME | sysname | Constraint name. |
| TABLE_CATALOG | nvarchar(128) | Table qualifier. |
| TABLE_SCHEMA | nvarchar(128) | Name of schema that contains the table. Important: The only reliable way to find the schema of an object is to query the sys.objects catalog view. |
| TABLE_NAME | sysname | Table name. |
| CONSTRAINT_TYPE | varchar(11) | Type of constraint: CHECK UNIQUE PRIMARY KEY FOREIGN KEY |
| IS_DEFERRABLE | varchar(2) | Specifies whether constraint checking is deferrable. Always returns NO. |
| INITIALLY_DEFERRED | varchar(2) | Specifies whether constraint checking is at first deferred. Always returns NO. |
See Also
System Views (Transact-SQL)
Information Schema Views (Transact-SQL)
sys.objects (Transact-SQL)
sys.key_constraints (Transact-SQL)
sys.check_constraints (Transact-SQL)
sys.tables (Transact-SQL)