c# code 128 source Lesson 3: Creating Calculations and Queries by Using MDX in Visual C#

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Lesson 3: Creating Calculations and Queries by Using MDX
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figure 6-15 Use the Form View toolbar of the Calculations tab to enter the properties of the
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calculation member in predefined fields.
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In the Display Folder column, type sales summary. Leave the Associated Measure Group column empty because the Sales Amount calculated member spans two measure groups, it cannot be logically associated with either of them. Click OK to close the Calculation Properties dialog box. Deploy the solution, and then click the Browser tab. In the Measure Group pane, expand the Measures node, and notice that there is a new Sales Summary folder. Expand the Sales Summary folder. Notice that the Sales Amount calculated member has a special icon to differentiate it from the regular measures. To test the Sales Amount calculated member, drag it to the data section of the report.
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Implement a named Set
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In this exercise, you will implement a named set in BIDS that will return the top 50 customers by evaluating the Internet Sales Amount measure.
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With the Adventure Works cube open in the Cube Designer, navigate to the Calculations tab. Click the New Named Set button on the toolbar.
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Extending SSAS Cubes
3. 4.
In the Name box, type [top 50 most profitable customers]. Enter the following expression in the Expression box:
TopCount ( (EXISTING [Customer].[Customer].[Customer].Members), 50, [Measures].[Internet Sales Amount])
Deploy the solution, and then switch to the Browser tab. If the report pane has existing results displayed, select the results and then click the Clear Results button on the toolbar to clear them. The Browser does not support named sets on reports. However, you can test a named set as a filter to the report.
BEST PRACTICES
use a pivOttabLe repOrt tO test nameD sets
you can create a PivotTable report in Excel 2007 to test named sets on report columns or rows.
Expand the Customer dimension. SSAS has discovered that the [Top 50 Most Profitable Customers] named set uses members of the Customer dimension, so it has automatically associated the named set with the Customer dimension. Although you cannot assign the named set to another dimension or measure group, you can use the Calculation Properties window to assign the named set to a display folder inside the Customer dimension. Drag the [Top 50 Most Profitable Customers] named set onto the dimension filter. Drag the Customer attribute hierarchy onto rows and Internet Sales Amount onto data, as Figure 6-16 shows. Notice that only the top 50 customers are returned.
7. 8.
figure 6-16 Test the named set in the Browser tab of Cube Designer by dragging it onto the
dimension filter.
Lesson 3: Creating Calculations and Queries by Using MDX
Quick check
1 . What are the first two axes of an MDX query 2. What is the difference between a calculated member and a regular measure in
terms of storage
3. What is a named set
Quick check answers
1 . CoLuMnS and RoWS are the first two axes of an MDX query. 2. The values of a regular measure are stored on the disk, and the values of a
calculated member are calculated at run time.
3. A named set is a set consisting of dimension members.
case scenario: extending ssas cubes
As it stands, the Adventure Works cube has data only for Internet sales. However, the business requirements state that the reporting solution must support consolidated reports that show both Internet and reseller sales. Adventure Works is also in the process of developing a Webbased dashboard solution, which needs to display vital business metrics in the form of KPIs.
1. 2.
What do you need to change in the dimensional model to accommodate the reseller sales How could you implement the Adventure Works KPIs
chapter summary
The cube space is defined by attributes. Sometimes there are logical relationships among attributes within the same dimension. You should understand and explicitly define such relationships to optimize the UDM. In addition to attribute hierarchies, you can define user hierarchies that provide useful navigation paths in the UDM. A dimension can have several user hierarchies. You can browse data in a measure group by a dimension only if the dimension is joined to the measure group. You must review the Dimension Usage tab and correct the dimension relationships if needed. In addition to regular relationships, SSAS supports other relationship types to support more complex schemas. Key performance indicators (KPIs) are quantifiable measures that organizations can use to track business performance. A KPI has four main properties: Value, Goal, Status, and Target.
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