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set-nocount-transact-sql.md

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title SET NOCOUNT (Transact-SQL)
description SET NOCOUNT (Transact-SQL)
author WilliamDAssafMSFT
ms.author wiassaf
ms.date 12/09/2021
ms.prod sql
ms.prod_service synapse-analytics, database-engine, sql-database
ms.technology t-sql
ms.topic reference
f1_keywords
NOCOUNT
SET_NOCOUNT_TSQL
NOCOUNT_TSQL
SET NOCOUNT
helpviewer_keywords
NOCOUNT option
number of rows affected by statement
row affected by statements [SQL Server]
counting rows
SET NOCOUNT statement
dev_langs
TSQL
monikerRange =azuresqldb-current||=azure-sqldw-latest||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current

SET NOCOUNT (Transact-SQL)

[!INCLUDE sql-asdb-asdbmi-asa-pdw]

Stops the message that shows the count of the number of rows affected by a [!INCLUDEtsql] statement or stored procedure from being returned as part of the result set.

Topic link icon Transact-SQL Syntax Conventions

Syntax

  
SET NOCOUNT { ON | OFF }

[!INCLUDEsql-server-tsql-previous-offline-documentation]

Remarks

When SET NOCOUNT is ON, the count is not returned. When SET NOCOUNT is OFF, the count is returned.

The @@ROWCOUNT function is updated even when SET NOCOUNT is ON.

SET NOCOUNT ON prevents the sending of DONEINPROC messages to the client for each statement in a stored procedure. For stored procedures that contain several statements that do not return much actual data, or for procedures that contain [!INCLUDEtsql] loops, setting SET NOCOUNT to ON can provide a significant performance boost, because network traffic is greatly reduced.

The setting specified by SET NOCOUNT is in effect at execute or run time and not at parse time.

To view the current setting for this setting, run the following query.

DECLARE @NOCOUNT VARCHAR(3) = 'OFF';  
IF ( (512 & @@OPTIONS) = 512 ) SET @NOCOUNT = 'ON';  
SELECT @NOCOUNT AS NOCOUNT;

Permissions

Requires membership in the public role.

Examples

The following example prevents the message about the number of rows affected from being displayed. In the following example, "(5 rows affected)" will only be returned to clients from the first SELECT statement.

USE AdventureWorks2012;  
GO  
SET NOCOUNT OFF;  
GO  
-- Display the count message.  
SELECT TOP(5) LastName  
FROM Person.Person  
WHERE LastName LIKE 'A%';  
GO  
-- SET NOCOUNT to ON to no longer display the count message.  
SET NOCOUNT ON;  
GO  
SELECT TOP(5) LastName  
FROM Person.Person  
WHERE LastName LIKE 'A%';  
GO  
-- Reset SET NOCOUNT to OFF  
SET NOCOUNT OFF;  
GO

See Also