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SQL Server Developer Tips and Tricks


Latest SQL Server Tips
Resolving the MERGE statement attempted to UPDATE or DELETE the same row more than once error
I'm receiving the following error when attempting to run a T-SQL MERGE statement: "Msg 8672, Level 16, State 1, Line 123. The MERGE statement attempted to UPDATE or DELETE the same row more than once. This happens when a target row matches more than one source row. A MERGE statement cannot UPDATE/DELETE the same row of the target table multiple times. Refine the ON clause to ensure a target row matches at most one source row, or use the GROUP BY
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Getting started with SQL Server database diagrams
Trying to visual a database model is sometimes quite difficult. When the model is small it is pretty easy to have an idea what tables reference other tables. But at the data model gets larger it is often difficult to see exactly how the tables relate. In this tip I show you how you can use the built-in SQL Server database diagram tool. I go through some of them messages you may get when getting started and then look at various tasks that you
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Improving SQL Server Performance by Writing Faster T-SQL Code
Stored procedures and functions are the mainstay of SQL Server coding. In this session you will learn techniques to locate problematic code and to improve the performance of procedures and functions.

Step one is to discover where the time is going using standard server traces, code that analyzes the trace, and the new SQL Server Extended Events. Once we know where the time is going we will look at strategies to improve performanc
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