table-constraints-transact-sql.md

title	TABLE_CONSTRAINTS (Transact-SQL) | Microsoft Docs
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ms.date	03/15/2017
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TABLE_CONSTRAINTS (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-asdb-xxxx-xxx_md]

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 ** Do not use INFORMATION_SCHEMA views to determine the schema of an object. The only reliable way to find the schema of a 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 ** Do not use INFORMATION_SCHEMA views to determine the schema of an object. The only reliable way to find the schema of a 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)