Calculations provide the ability to define the derivation of a value at query time within a cube. The calculation is most typically a numeric derivation based on measures, but can be defined against any dimension. The calculation is defined in MDX (Multi-Dimensional eXpressions). The definition of a Calculation is shown by right-clicking a Calculation and choosing Properties. The following Cube Calculated Member Definition window is displayed:
Fields | Description |
|---|---|
Cube Name | A Read Only field that indicates against which OLAP Cube the Calculation is defined. |
Calculated Member Name | Specifies the Analysis Services name defined for the Calculation. |
Update Buttons | The Update Buttons: Update <- and Update -> are used to move from the current Calculation to the previous and next Calculation respectively for the current OLAP Cube. The alternative is to exit the Calculation and choose the next Calculation Properties screen. |
Description | A business description of the Calculation that is used to populate WhereScape RED documentation. |
Expression | Specifies the MDX expression that defines the calculation. |
Parent Hierarchy | Specifies where the calculation is displayed for use. By default, and in most cases, this will be 'Measures'. This means that the calculated member is displayed to the end user of the cube as a measure, otherwise known as a calculated measure. Alternatively, you can include the calculated member in a dimension instead of in the measures. Hierarchies are descriptive categories of a dimension by which the measures in a cube can be separated for analysis. A calculated member provides a new label in the parent dimension you select. |
Parent Member | This is not available if you select Measures as your parent hierarchy, or if you select a one-level hierarchy. Hierarchies are divided into levels that contain members. Each member produces a heading in the cube. While browsing a cube, users can drill down to subordinate headings. The heading for the calculated member is added directly below the selected Parent Member. |
Associated Measure Group | Specifies against which Measure Group the Measure is defined. This is related to the fact table of which the Measure is an attribute. Note SSAS 2008+ uses the property Associated Measure Group but previous versions of SSAS do not and can result in errors when creating the cube. It is possible to set this attribute in RED to (Undefined) for previous versions of RED, but this is not necessary for the current version of RED as this attribute will only be used when appropriate. |
Display Folder | Cube Calculations can be organized into user-defined folders to view and manage these attributes within the Analysis Services user interface more easily. Enter the display folder name. Note One object can be in multiple display folders, for example: |
Display Format | Specifies the format used by clients when displaying the measure value. |
Visible | Specifies whether the calculation is visible to client tools. |
Non Empty Behavior | Determines the non-empty behavior associated with the calculation. |
Order Number | The create order of the member in the dimension hierarchy. |
To View Calculations | To view the list of calculations (sometimes called a calculated measure), right-click the OLAP Cube in the left pane and then select Display Calculations. |
To Add a Calculation |
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To Delete a calculation | Display the calculations in the middle pane, select the calculation to delete, right-click and select Delete. |
