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SQL SET NOCOUNT ON

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The SQL SET NOCOUNT ON and OFF is one of the Set Function, which is used to stop the number of rows affected message from a query or Stored Procedure to the client. 

In general, When you select data from a table, a stored procedure or query will return those records as the result. And it displays the message as Number of Rows affected because of SQL Set Nocount On. For instance, If you INSERT 10 records into any table, then SQL will return the message as ten records affected, etc.

By using this SQL Server SET NOCOUNT ON, you can stop the above messages. In real-time, it is an extra load to display those messages. So, try to use SET NOCOUNT ON for better performance. Before we get into the SET NOCOUNT ON and SET NOCOUNT OFF example, let us see the syntax behind this:

SQL SET NOCOUNT ON Syntax

The basic syntax of the SET NOCOUNT ON is as shown below:

SET NOCOUNT {ON | OFF }

We are going to use the below-shown data for this demonstration

SQL ROWCOUNT 1

SQL SET NOCOUNT ON Example

In this example, we show you how the SET NOCOUNT ON will affect the queries. Before we get into the main example, let me write a simple SELECT Statement to show you the message that is displayed by the SQL.

SELECT [FirstName]
      ,[LastName]
      ,[Occupation]
      ,[Education]
      ,[YearlyIncome]
      ,[Sales]
FROM [Employee]

OUTPUT

SQL SET NOCOUNT ON EXAMPLE 1

From the above SQL Server screenshot, you can see that the table contains 14 records. Now, let us navigate to Message Tab (besides the Result Tab) to check the message.

SQL SET NOCOUNT ON EXAMPLE 2

As you see that, it is displaying the message as 14 row(s) affected

Let us use the SET NOCOUNT ON Statement

SET NOCOUNT ON;  
GO  
SELECT [FirstName]
      ,[LastName]
      ,[Occupation]
      ,[Education]
      ,[YearlyIncome]
      ,[Sales]
FROM [Employee]

OUTPUT

SQL SET NOCOUNT ON EXAMPLE 3

As you can see, it doesn’t affect the query result. Now, let us go to Message Tab to check for the message.

SQL SET NOCOUNT ON EXAMPLE 4

As you see that, there is No message such as 14 rows affected

SQL SET NOCOUNT OFF

Use the SET NOCOUNT OFF to display the rows affected the message

SET NOCOUNT OFF;  
GO  
SELECT [FirstName]
      ,[LastName]
      ,[Occupation]
      ,[Education]
      ,[YearlyIncome]
      ,[Sales]
FROM [Employee]

OUTPUT

SQL SET NOCOUNT ON EXAMPLE 5

Please refer to Stored Procedures and Insert Statement articles.

Placed Under: SQL