SQL Saturday #486 Richmond – A Window Into Your Data

 

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Thanks for attending my session on window functions in TSQL. I hope you learned something you can take back and use in your projects or at your work. You will find an link to the session and code I used below. If you have any questions about the session post them in comments and I will try to get you the answers.

Questions

  1. Can an OVER clause be used in the WHERE clause?
    • No. The OVER clause can only be used in SELECT and ORDER BY clauses.
  2. Some follow up on ROWS and RANGE with context to CURRENT ROW.
    • We had a lot of discussion around this. In our examples below, RANGE aggregated all the data that fit into the ORDER BY clause. ROWS only referenced the row it was in. So, RANGE looks at everything that meets the criteria established by the PARTITION BY and ORDER BY clauses. ROWS is bound to the physical row.
    • Code examples:
      • OVER (PARTITION BY CustomerName ORDER BY OrderDate RANGE CURRENT ROW)
        • Summed two rows of data for the customer with the date. Both rows had the same date.
      • OVER (PARTITION BY CustomerName ORDER BY OrderDate ROWS CURRENT ROW)
        • Each row only contained the data for the row it was in.

Slides, Code, and Follow Up Posts

The presentation can be found here: A Window into Your Data

The code was put into a Word document that you can get here: TSQL Window Function Code

This session is also backed by an existing blog series I have written.

T-SQL Window Functions – Part 1- The OVER() Clause

T-SQL Window Functions – Part 2- Ranking Functions

T-SQL Window Functions – Part 3: Aggregate Functions

T-SQL Window Functions – Part 4- Analytic Functions

Microsoft Resources:

Excel Tip #30: Excel Services Visual Limitations – Displaying Images

As I mentioned in my original post, Exploring Excel 2013 as Microsoft’s BI Client, I will be posting tips regularly about using Excel 2013 and later.  Much of the content will be a result of my daily interactions with business users and other BI devs.  In order to not forget what I learn or discover, I write it down … here.  I hope you too will discover something new you can use.  Enjoy!

Introducing Brian Wright – Guest Blogger

Brian Wright

Today, I am happy to announce that Brian will be joining DataOnWheels as a guest blogger. I have worked with Brian over the past couple of years and his Excel visualization skills are great. I look forward to his contributions to the Excel Tips series and other BI related topics. Thanks Brian.

Hello Data on Wheels Readers! Let’s start this blog post by letting you know a few things about myself. First, I am not a professional writer, blogger, or ever social guru, but I am passionate about what I do. I love data visualization. Watching boring data come to life in a visual report or dashboard is my “thing”. Secondly, when things don’t work the way I think they should, I become obsessed in finding out a way around it.

Images Are Not Displayed in Excel Services

That is what leads us to this blog post today. In the limited environment I work within, Excel Services is used quite often in our BI suite of tools. When I realized that the ever so important images I was adding in my Excel workbooks would not show on Excel Services, my obsession kicked in.

Here is the trick or hack. (Using the word hack makes me look much cooler in my kid’s eyes). Wherever you want your picture within your workbook, simply add a chart. Yes, you read correct, simply add a chart.

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Using Charts to Display Images

The trick here is not to link the chart to any type of data at all. Just leave it blank. Right Click on the blank chart and navigate to “Format Chart Area”. Navigate to the fill area and select “Pattern or Texture Fill”.

Next, click on the File Button and select your image. Your image will now show as a background image in your chart. Save and then voila!

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Once Excel Services displays your workbook, you will be pleasantly surprised to see your image right where you want it!