sys.sysconstraints (Transact-SQL)

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2012)noAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

Contains mappings of constraints to the objects that own the constraints within the database.


This SQL Server 2000 system table is included as a view for backward compatibility. We recommend that you use the current SQL Server system views instead. To find the equivalent system view or views, see Mapping System Tables to System Views (Transact-SQL). This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.

|Applies to: SQL Server ( SQL Server 2008 through current version).|

Column name Data type Description
constid int Constraint number.
id int ID of the table that owns the constraint.
colid smallint ID of the column on which the constraint is defined.

0 = Table constraint
spare1 tinyint Reserved
status int Pseudo-bit-mask indicating the status. Possible values include the following:

1 = PRIMARY KEY constraint

2 = UNIQUE KEY constraint

3 = FOREIGN KEY constraint

4 = CHECK constraint

5 = DEFAULT constraint

16 = Column-level constraint

32 = Table-level constraint
actions int Reserved
error int Reserved

See Also

Mapping System Tables to System Views (Transact-SQL)
Compatibility Views (Transact-SQL)