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4: DAX: Overview
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This will fail, and the smart tag will tell you why We need a relationship before we can use RELATED() Accept the error for now and rename the column to Category Re-establish our deleted relationship first, from the Design ribbon, choose Relationships group | Create Relationship button In the Create Relationship dialog, relate the Products table to the Categories table on the CategoryID column before clicking Create The Create Relationship dialog is shown in Figure 4-6 Your Category column, using the RELATED() function, should now be working Switch to Excel and click the Refresh button at the top of the field list Replace CategoryName from the Categories table with Category from the Products table Make sure that Category is above ProductName in the Row Labels drop-zone Now your pivot table is looking good The result is shown in Figure 4-7 The subtotals appear reasonable and Alice Mutton is under Meat/Poultry only and Chai can only be seen under Beverages
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Prac tical PowerPivot & DAX Formulas for Excel 2010
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But you can even go one better than this! You don t need the Categories table in the field list it s only going to confuse your business user After all, you have just denormalized its data (that is, the category name) into the Products table Switch to PowerPivot Hide all the columns of the Categories table from the pivot table With the Categories table current, click the Hide and Unhide button in the Columns group on the Design ribbon The resulting Hide and Unhide Columns dialog is shown in Figure 4-8 Turn off the check box in the In PivotTable column of the (Select All) row and click OK 10 Switch to Excel and click the Refresh button at the top of the field list The Categories table has disappeared from the PowerPivot Field List When you hide all of a table s columns in this manner, you are also hiding the table itself That s quite powerful stuff You have put two tables into one and hidden one of them This greatly simplifies the end-user experience Your users don t need to know about the Categories table and whether it has relationships or not indeed, they may not even understand relationships In addition, they now have a nice drill-down from category to product If you are familiar with SSAS cube design, you have just simulated a natural user hierarchy in one table based on attributes from two tables You have hidden the original attribute (CategoryName) that now populates a new level (Category) in your new, simulated natural user hierarchy You can easily extend this You can create a drill-down hierarchy in one table based on three or more tables For example, you could display the category for each order line
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Hide and Unhide Columns dialog
4: DAX: Overview
in the Orders Details table Your column would need to reference the Products table, which in turn references the Categories table This is, in effect, a double jump The next two lines of code show how (the first goes in the Products table; the second goes in the Order Details table and assumes that the first one is named Category):
=RELATED(Categories[CategoryName]) =RELATED(Products[Category])
This is all very nice, but there is one proviso You can t relate a table to itself in PowerPivot, and therefore, you can t use RELATED() if it references a column in the same table Thus, you can t create a hierarchy directly in the Employees table This is a self-join table, in a relational source, with the Reports To column referencing the EmployeeID column During the import of this table (assuming a relational source), if you click the Details hyperlink in the Messages column of the Data Preparation row, you will see the message that self-joins are not supported To get around this problem, you are probably going to have to write some SQL that joins the table to itself and unravels the hierarchy You might use a common table expression (CTE) to do so RELATED() has a sibling function, RELATEDTABLE() In general, RELATED() would appear in a child table (the many side of a relationship) and pull back a column from a parent table For example, you could add the category name to a products table In general, RELATEDTABLE() would appear in the parent table and reference the matching rows in the child table As it may well return more than one matching row, RELATEDTABLE() returns a table rather than a column As such, it can t be used to populate a column directly However, it can be fed into another DAX function that accepts a table as a parameter The so-called X-functions do just that Here s an example:
=COUNTX(RELATEDTABLE('Order Details'),'Order Details'[OrderID])
If you have a calculated column in the Orders table, this will show how many order lines there were in each order
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