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TABLE_CONSTRAINTS (Transact-SQL)

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Applies to: yesSQL Server (all supported versions) YesAzure SQL Database YesAzure 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 ** 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 ** 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)