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«October 2015»

Data Warehouse from the Ground Up at SQL Saturday Orlando, FL on Oct. 10th

SQL Saturday #442SQL Saturday #442 is upon us and yours truly will be presenting in Orlando, Florida on October 10th alongside Mitchell Pearson (b|t). The session is scheduled at 10:35 AM and will last until 11:35 AM. I’m very excited to be presenting at SQL Saturday Orlando this year as it’ll be my first presenting this session in person and my first time speaking at SQL Saturday Orlando! If you haven’t registered yet for this event, you need to do that. This event will be top notch!

My session is called Designing a Data Warehouse from the Ground Up. What if you could approach any business process in your organization and quickly design an effective and optimal dimensional model using a standardized step-by-step method? In this session I’ll discuss the steps required to design a unified dimensional model that is optimized for reporting and follows widely accepted best practices. We’ll also discuss how the design of our dimensional model affects a SQL Server Analysis Services solution and how the choices we make during the data warehouse design phase can make or break our SSAS cubes. You may remember that I did this session a while back for Pragmatic Works via webinar. I’ll be doing the same session at SQL Saturday Orlando but on-prem! ;)

So get signed up for this event now! It’s only 11 days away!

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Create Date Dimension with Fiscal and Time

Here are three scripts that create and Date and Time Dimension and can add the fiscal columns too. First run the Dim Date script first to create the DimDate table. Make sure you change the start date and end date on the script to your preference. Then run the add Fiscal Dates scripts to add the fiscal columns. Make sure you alter the Fiscal script to set the date offset amount. The comments in the script will help you with this.

This zip file contains three SQL scripts.

Create Dim Date

Create Dim Time

Add Fiscal Dates

These will create a Date Dimension table and allow you to run the add fiscal script to add the fiscal columns if you desire. The Create Dim Time will create a time dimension with every second of the day for those that need actual time analysis of your data.

Make sure you set the start date and end date in the create dim date script. Set the dateoffset in the fiscal script.

Download the script here:


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SSRS Top N and Bottom N Reporting with Duplicates

  • 13 June 2011
  • Author: MikeDavis
  • Number of views: 1029

Previously I wrote a blog on Top N and Bottom N reporting. There were a couple of gotcha I did not cover in that blog so I thought I would cover those here to answer some of the questions I have received. The other blog can be found here.

On a report you are trying to group the top N number of rows together and all others should be in a separate group. Let’s say you want the top 5 sales people based on amount.

In my other blog I showed how to use the Top N and Bottom N filters on groups. The major problem comes in when you have duplicate amounts at the cut off. For example if you want the top 5 sales employees to be in one group based on their sales amount, and three employees tie for the number 5 slot. This would cause more than 5 people to show in the top N group and those same people would show in the bottom N using the technique I showed in the previous blog.

So how do you fix this? You will need a different method to do this. You need to find the cut off amount and spilt the top from the bottom based on that amount.

Here is the table we will use on the report. Notice that positions 4, 5, and 6 have the same amount. If you set the filter on the report to top 5 you will get 6 rows in the top. The Bottom N method I showed in the previous blog will fail because the bottom group will not know about the extra rows in the top group. This will cause row 6 to show in both groups.

Top N Bottom N
A better way to do this Top N and Bottom N grouping would be to find the cut off amount and filter the groups based on this.

Here is the main query pulling the data to show on the table.

SELECT        RowNum, Name, Amount
FROM            TopN


Now you need to create a new data set and the query will look like below

With O as(
Select top (@N) t.RowNum, t.Amount, t.Name
From TopN t
Order by Amount desc
Select Top 1 Amount
From O
Order by Amount


I named this dataset MinTopAmount. This query is using a CTE to get the top N amounts. N is a parameter on the report, you can hard code this if desired. Then the outside query gets the lowest amount from that query. This gives you the lowest amount to show in the top N group. This query will only return single row and column with the cut off amount.

Now you need to set up the filters on the groups to filter based on the amount instead of Top or Bottom. These are two adjacent groups on a single table.

Top N Bottom N
The Sum of the Amount value form the new dataset, which is named MinTopAmount in this example, should not sum anything because the query only returns one row due to the top 1 in the query with the CTE. The bottom group will have the exact same filter except it will use less than instead of greater than or equal to.

With the N set to 5 it will divide based on the amount at the fifth spot. If there is a tie, it won’t matter.

In this image you can see the bottom group in blue. Notice even though we selected Top 5 we get 6 rows in the top due to the tie, everyone else is in the bottom group.

Top N Bottom N
If you have any issues let me know.

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