A CONCAT Function For The Rest Of Us
SQL Server 2012 introduces a new string concatenation function. This can be recreated in earlier versions of SQL Server.
2012-06-06 (first published: 2012-05-16)
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Mike McQuillan
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Question of the Day
Query Plan Regressions --
For the Question of the day, I am going to go deep, but try to be more clear, as I feel like I didn't give enough info last time, leading folks to guess the wrong answer... :) For today's question: You’re troubleshooting a performance issue on a critical stored procedure. You notice that a previously efficient query now performs a full table scan instead of an index seek. Upon investigating, you find that an NVARCHAR parameter is being compared to a VARCHAR column in the WHERE clause. What is the most likely cause of the query plan regression?
See possible answers