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title: "sp_helpconstraint (Transact-SQL) | Microsoft Docs" ms.custom: "" ms.date: "03/14/2017" ms.prod: sql ms.prod_service: "database-engine, sql-database" ms.component: "system-stored-procedures" ms.reviewer: "" ms.suite: "sql" ms.technology: system-objects ms.tgt_pltfrm: "" ms.topic: "language-reference" f1_keywords:

  • "sp_helpconstraint"
  • "sp_helpconstraint_TSQL" dev_langs:
  • "TSQL" helpviewer_keywords:
  • "sp_helpconstraint" ms.assetid: 29d6cd36-535d-4765-bca8-62f9d9886ff5 caps.latest.revision: 33 author: edmacauley ms.author: edmaca manager: craigg monikerRange: "=azuresqldb-current||>=sql-server-2016||=sqlallproducts-allversions||>=sql-server-linux-2017"

sp_helpconstraint (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-asdb-xxxx-xxx-md]

Returns a list of all constraint types, their user-defined or system-supplied name, the columns on which they have been defined, and the expression that defines the constraint (for DEFAULT and CHECK constraints only).

Topic link icon Transact-SQL Syntax Conventions

Syntax

  
sp_helpconstraint [ @objname = ] 'table'   
     [ , [ @nomsg = ] 'no_message' ]

Arguments

[ @objname= ] 'table'
Is the table about which constraint information is returned. The table specified must be local to the current database. table is nvarchar(776), with no default.

[ @nomsg=] 'no_message'
Is an optional parameter that prints the table name. no_message is varchar(5), with a default of msg. nomsg suppresses the printing.

Return Code Values

0 (success) or 1 (failure)

Result Sets

sp_helpconstraint displays a descending indexed column if it participated in primary keys. The descending indexed column will be listed in the result set with a minus sign (-) following its name. The default, an ascending indexed column, will be listed by its name alone.

Remarks

Executing sp_helptable reports all information about the specified table. To see only the constraint information, use sp_helpconstraint.

Permissions

Requires membership in the public role.

Examples

The following example shows all constraints for the Product table.

USE AdventureWorks2012;  
GO  
EXEC sp_helpconstraint 'Production.Product';

See Also

Database Engine Stored Procedures (Transact-SQL)
ALTER TABLE (Transact-SQL)
CREATE TABLE (Transact-SQL)
sp_help (Transact-SQL)
System Stored Procedures (Transact-SQL)
sys.key_constraints (Transact-SQL)
sys.check_constraints (Transact-SQL)
sys.default_constraints (Transact-SQL)