In my previous article I have explained about how to Get number of affected rows in sql. In this article I will explain about how to restrict the number of rows affected in sql server.
To restrict the number of rows affected by sql server SET ROWCOUNT is used. It Causes SQL Server to stop processing the query after the specified number of rows are returned.
number | @number_var
Is the number, an integer, of rows to be processed before stopping the specific query.
To set this option off so that all rows are returned, specify SET ROWCOUNT 0
Setting the SET ROWCOUNT option causes most Transact-SQL statements to stop processing when they have been affected by the specified number of rows. This includes triggers and data modification statements such as INSERT, UPDATE, and DELETE. The ROWCOUNT option does not affect dynamic cursors, but it does limit the rowset of keyset and insensitive cursors. This option should be used with caution and primarily with the SELECT statement.
SET ROWCOUNT is ignored in INSERT, UPDATE, and DELETE statements when an explicit TOP expression is used in the same statement. This includes statements in which INSERT is followed by a SELECT clause.
The setting of SET ROWCOUNT is set at execute or run time and not at parse time.
SET ROWCOUNT stops processing after the specified number of rows. In the following example, note that 545 rows meet the criteria of
300. However, from the number of rows returned by the update, you can see that not all rows were processed. ROWCOUNT affects all Transact-SQL statements.
Here is the result set.
4and update all rows with a
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