Exec sp_executesql update

For example, the following example will be displayed only FirstName column:. In the previous example, we executed the dynamically constructed query with the EXEC statement but we need to take account one point about it. We could not parametrize the EXEC statement and this is the main drawback of it. Each query executed in SQL Server is compiled before it is executed. This query compilation process generates an output that is called the query plan. However, this query compilation process might be very expensive sometimes.

For this reason, SQL Server wishes to reuse the cached query plans as possible as for the same queries in order to degrade the query compilation costs. Now, we will prove this idea. However, do not execute this command in the production environment because it could be damage to the performance of the SQL Server:.

Now we will check out the generated query plans in the sys. In this step, we will execute the dynamically constructed query 3 times for the random parameters with the EXEC statement:. The point is to use deferred name resolution and prevent any missing objects being accessed at runtime using conditional logic. See sommarskog. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related 6. The main difference with input parameters is that this time we need to add the OUTPUT keyword in the parameter definition, and we should define a variable outside the dynamic SQL to store the output value as following:.

In this query, the outCount variable defined outside of the dynamic SQL statement is used to read the value stored within the Count variable defined within the dynamic SQL statement. Figure 8 — Using an output parameter within a dynamic SQL query. Simultaneously, it cannot execute parameterized queries which means that it is more vulnerable for SQL injections. Additionally, we learned how to work with input and output parameters. Person' ;. Author Recent Posts.

Hadi Fadlallah. Hadi is an SQL Server professional with more than 10 years of experience. His main expertise is in data integration.