Kathi Kellenberger

Kathi Kellenberger is the Editor of Simple Talk and a Microsoft Data Platform MVP. She has worked with SQL Server for almost 20 years and has authored, co-authored, or tech edited over a dozen technical books. Kathi is the co-leader of the PASS Women in Technology Virtual Group and a volunteer at LaunchCode. When Kathi isn’t working she enjoys spending time with family and friends, cycling, singing, and climbing the stairs of tall buildings. Be sure to check out her courses on Pluralsight.

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09 January 2018
09 January 2018

Time Off

Time is a precious commodity, and so much of our time is dedicated to working. IT professionals often have jobs with good benefits, including generous paid time off. It’s very important to get away from work to relax and recharge, but, sometimes, it’s difficult to take those days that belong to us. Even when we … Read more
27 December 2017
27 December 2017

Self-improvement: Uniquely Human

There are many things that separate humans from other animals. One of those things is our interest in improving ourselves. Many of us are motivated, especially this time of year, to learn languages, better our health, develop leadership qualities, or increase wealth. There is an entire genre of literature dedicated to self-improvement, also known as … Read more
16 March 2016
16 March 2016

T-SQL Window Function Speed Phreakery: The FIFO Stock Inventory Problem

Sometimes, in the quest for raw SQL performance, you are forced to sacrifice legibility and maintainability of your code, unless you then document your code lavishly. Phil Factor's SQL Speed Phreak challenge produced some memorable code, but can SQL features introduced since then help to produce code that performs as well and is also easy to understand? Aunty Kathi investigates.… Read more
06 January 2015
06 January 2015

SQL Server Reporting Services Basics: Deploying Reports

Having designed and tested our reports, it's time to deploy them to the Report Server, so that our users can access them. Kathi Kellenberger demonstrates how to configure reports for native-mode deployment using Report Manager, and then deploy them from within SSDT-BI. She also explains how to use the Report Builder to provide "self-service" reporting to end users, allowing them to build custom reports based on report parts and shared datasets.… Read more
03 December 2014
03 December 2014

SQL Server Reporting Services Basics: The Visual Controls

The challenge of report development is to present complex data in a simple, visually compelling way. The goal is to make it as quick and easy as possible for others in the organization to use that data to make decisions, to see progress towards a business target, or spot and act on worrying trends sooner rather than later. Kathi Kellenberger demonstrates how to start adding visual flair to your SSRS reports, using its impressive set of visual controls, ranging from basic charts to gauges, indicators, sparklines, and maps.… Read more
27 August 2014
27 August 2014

SQL Server Reporting Services Basics: Customizing SSRS Reports

While the Reporting Wizard and basic report tables will do for prototyping, very soon we'll want to add some finesse to our reports, and allow our report users to create different views of the same data, dynamically. Kathi Kellenberger shows how to use expressions, functions, grouping, the matrix control, and other features, to add a degree of user control to the reports while maintaining visual clarity.… Read more
25 April 2014
25 April 2014

SQL Server Reporting Services Basics: Building SSRS Reports

SQL Server Reporting Services is one of the most popular components of SQL Server, but it has always been surprisingly difficult to get from one place all the basic facts you need to get up and running from scratch, to the point of producing reports. Here Kathi Kellenberger quickly describes the basics of SSRS before showing how to build quick, simple reports.… Read more
18 March 2013
18 March 2013

Solving Complex T-SQL Problems, Step-By-Step

What should you do if your first, most intuitive solution to a problem ends up scanning the data more than is necessary, resulting in poor performance? Have you missed a new SQL Server feature that can remove inefficiency from your technique? Alternatively, do you need a little help, and some lateral thinking, to open the path to a different approach? Sometimes, the answer is "both".… Read more
25 May 2010
25 May 2010

Set-based Speed Phreakery: The FIFO Stock Inventory SQL Problem

The SQL Speed Freak Challenge is a no-holds-barred competition to find the fastest way in SQL Server to perform a real-life database task. It is the programming equivalent of drag racing, but without the commentary box. Kathi has stepped in to explain what happened with the second challenge and why some SQL ran faster than others.… Read more
04 February 2010
04 February 2010

Writing Efficient SQL: Set-Based Speed Phreakery

Phil Factor's SQL Speed Phreak challenge is an event where coders battle to produce the fastest code to solve a common reporting problem on large data sets. It isn't that easy on the spectators, since the programmers don't score extra points for commenting their code. Mercifully, Kathi is on hand to explain some of the TSQL coding secrets that go to producing blistering performance. … Read more