SET NOCOUNT (Transact-SQL)

SET NOCOUNT (Transact-SQL)

 

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse noParallel Data Warehouse

Stops the message that shows the count of the number of rows affected by a Transact-SQL statement or stored procedure from being returned as part of the result set.

Topic link icon Transact-SQL Syntax Conventions

  
SET NOCOUNT { ON | OFF }   

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 DONE_IN_PROC 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 Transact-SQL 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;  
  

Requires membership in the public role.

The following example prevents the message about the number of rows affected from being displayed.

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  

@@ROWCOUNT (Transact-SQL)
SET Statements (Transact-SQL)

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