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Advanced Design
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Each of those measures already has an aggregation function defined. Using the Aggregate function takes advantage of that previously defined aggregation function.
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Creating Cumulative Calculations
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Almost all OLAP cubes contain a time dimension. That s because almost all business activities take place over time, and it s always useful to compare where one is with where one was. Not surprisingly, many business reporting requirements involve the use of time, and consequently, MDX supports a large number of functions that facilitate analyzing values with time. Calculating the cumulative values from the beginning of a particular time period, for example, is an extremely common MDX task. In this procedure, you ll add a calculated measure that computes a cumulative total across a specified range of time for Reseller Order Quantity, first by using the Sum function and then by using the PeriodsToDate function. Compare the Sum and PeriodsToDate functions 1. Click the Calculations tab, and then click New Calculated Member on the toolbar. 2. Name the member [Cumulative Order Quantity]. Cumulative measures belong in the Measures dimension, so you will leave the default Parent Hierarchy as Measures. 3. In the Calculation Tools pane, click the Functions tab, and from the Statistical Functions list, drag SUM into the Expression box. Notice that the syntax for the Sum function is similar to the syntax for the Average function: SUM( Set [, Numeric Expression ] ). 4. Replace Set with [Order Date].[Calendar Year].&[2001]:[Order Date].[Calendar Year] .CurrentMember. This expression creates a set that begins with the 2001 member of the Order Date dimension and ends with a year for the current position in the results grid. You use a colon (:) between two members to indicate a range of members. 5. Replace [, Numeric Expression ] with , [Measures].[Reseller Order Quantity]. 6. Select #,# in the Format String drop-down list.
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8:
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The Calculations form looks like this:
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7. Deploy the project. When it is deployed, click the Browser tab, click Reconnect, and then click Clear Results. 8. Drag Reseller Order Quantity and Cumulative Order Quantity from Measures into the grid. 9. From the Order Date dimension, drag the Order Date.Calendar Year attribute into the grid as rows. The grid looks like this:
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You can see the yearly values for Reseller Order Quantity in each row along with the cumulative values. An error displays in the Grand Total cell because there is no CurrentMember for the Order Date dimension related to this cell. For a production database, you should modify the expression to avoid this error condition using an IIF statement, as you learned earlier in this chapter. This expression, however, is limited in its usage since it will not work with the Calendar hierarchy, providing you with cumulative values for any level of the hierarchy year, quarter, or month. To create a more flexible expression, you can use the PeriodsToDate function. 10. Click the Calculations tab, and then change the expression to look like this:
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SUM( PeriodsToDate([Order Date].[Calendar].CurrentMember.Parent.Level, [Order Date].[Calendar].CurrentMember), [Measures].[Reseller Order Quantity] )
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Part III:
Advanced Design
11. Deploy the project, wait for deployment to finish, click the Browser tab, and then click Reconnect. 12. Drag the Calendar Year hierarchy from the grid, and then drag the Calendar hierarchy from the Order Date dimension to the rows axis of the grid. The values computed for the Cumulative Order Quantity are the same because the PeriodsToDate function creates a set much like the range you created when using the Sum function. 13. Click the Calendar Year caption in the grid to select it, right-click, and then click Expand Items. The beginning member of the set created by using the PeriodsToDate function is the first member that shares the same parent as the ending member. For example, in the Calendar hierarchy of the Order Date dimension, a current member of quarter 2 in 2002 would produce the set 1:2. (2002 is the comment parent.) A current member of June would produce the set April:June. (The quarter 2 is the common parent.) The level specified in the PeriodsToDate function resets the cumulative total to zero when the parent of the current member is different from the parent of the previous member. If you want to go back to a different common ancestor, simply specify the level of the ancestor you want. For example, if you replace [Order Date].[Calendar].CurrentMember.Parent.Level with [Order Date].[Calendar].CalendarYear, then a current member of June produces the range January:August. In this case, a change in the Year member resets the cumulative total to zero.
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