Articles

Indexes: When Column Selectivity Is Not Always A Requirement

While preparing for my SQL Saturday Salt Lake City presentation, Climbing the B-Tree, I ran into one of the “word of mouth” facts that the first column of an index should be highly selective, i.e., it should only point to one or a few rows. This is not always the case and I’ll show you […]

5 (1)

2020-09-16

1,759 reads

Free eBook: Defensive Database Programming

Resilient T-SQL code is code that is designed to last, and to be safely reused by others. The goal of defensive database programming, the goal of this book, is to help you to produce resilient T-SQL code that robustly and gracefully handles cases of unintended use, and is resilient to common changes to the database environment.

2020-09-16 (first published: )

105,836 reads

Power BI Histogram Example using DAX

Companies use a Bell Curve approach to measure performance. As part of this approach they create a histogram. A histogram is a statistical concept and according to Wikipedia it is defined as a graphical distribution of the numerical data. A histogram is made of several bins and bins can be considered a range of values or a benchmark

2020-09-16

SQL Server 2017 Installation Error with KB2919355

Recently I was installing SQL Server 2017 and I could not believe a simple installation took up my whole day. I was installing an instance on one newly built Windows 2012 R2 server. After clicking next a few times, I got an error: a rule failure, for KB2919355. I downloaded the KB2919355 as mentioned in […]

5 (1)

2020-09-14

2,090 reads

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Daily Coping 18 Sep 2020

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I started to add a daily coping tip to the SQLServerCentral newsletter and to...

Optimize for Unknown for Inline Table-Valued Functions

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I had a curious performance issue today. An inline table-valued function (iTVF) was performing...

Daily Coping 17 Sep 2020

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I started to add a daily coping tip to the SQLServerCentral newsletter and to...

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