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Bad Habits: Avoiding NULL in SQL Server
A long time ago, I answered a question about NULL on Stack Exchange entitled, “Why shouldn’t we allow NULLs?” I have my share of pet peeves and passions, and the fear of NULLs is pretty high up on my...
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Serializing Deletes From Clustered Columnstore Indexes
At Stack Overflow, we have some tables using clustered columnstore indexes, and these work great for the majority of our workload. But we recently came across a situation where “perfect storms” —...
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String Aggregation Over the Years in SQL Server
Since SQL Server 2005, the trick of using FOR XML PATH to denormalize strings and combine them into a single (usually comma-separated) list has been very popular. In SQL Server 2017, however,...
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T-SQL Can Be Expressive Without Sacrificing Performance
Even with its warts and limitations, Transact-SQL is a beautiful language, allowing for flexible declarative expression about what you’re asking the database engine to do for you. Itzik Ben-Gan has...
View Article10 For 10 : My 10 Favorite SQLPerformance Posts Over 10 Years
This is a month of milestones. I was awarded my 25th MVP award on July 5th, which I believe ties me with Tibor for the longest-tenured MVP. SQL Server 2012 went out of all forms of official support...
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