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In this article we will go over basic understanding of Rollup clause in SQL Server. ROLLUP clause is used to do aggregate operation on multiple levels in hierarchy. Let us understand how it works by using an example.
I quite often receive requests for the Data Mining Algorithms details. Book Online has wonderful resources for the same. I suggest to read them here.
I recently received an email from reader after reading my previous article on SQL SERVER – Plan Recompilation and Reduce Recompilation – Performance Tuning regarding how to recompile any stored procedure at run time. There are multiple ways to do this. If you want your stored procedure to always recompile at run time, you can add the keyword RECOMPILE when you create the stored procedure. Additionally, if the stored procedure has to be recompiled at only one time, in that case, you can add RECOMPILE word one time only and run the SP as well. Let us go over these two options.