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Examples of Calculated Columns
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These examples are reproduced (with one addition) from 2:
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='Order Details'[Quantity] * 'Order Details'[UnitPrice] =[Quantity] * [UnitPrice] =YEAR('Orders'[OrderDate]) =YEAR(Orders[OrderDate]) =YEAR([OrderDate]) =RELATED('Categories'[CategoryName])
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Prac tical PowerPivot & DAX Formulas for Excel 2010
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The fourth example is an addition to the formulas reproduced from 2 The first and second examples are equivalent The third, fourth, and fifth examples are equivalent Most DAX functions can appear in calculated column or measure formulas However, as RELATED() requires a row context, it is most often used for a calculated column or as an input to another DAX function RELATED(), an extremely useful function, is covered in more detail shortly
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Measures
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To create a measure, you must be in the Excel workbook (not the PowerPivot window) and you must have an existing pivot report with the focus either in the report or its PowerPivot Field List You then click the New Measure button on the PowerPivot ribbon, or right-click a table in the field list and choose Add New Measure Either action opens the Measure Settings dialog In this dialog, you enter your DAX formula in the Formula text box When you finish the formula, it s a good idea to click Check Formula (to verify your syntax) before clicking OK to exit the dialog
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Context of a Measure
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A measure has no context until it s added to the Values drop-zone Then its context is determined by the other attributes in the pivot table The context of a measure is given by your choices in Slicers Vertical, Slicers Horizontal, Report Filter, Column Labels, and Row Labels As an example, if you select only 1996 from a slicer based on Year, the values of the measure displayed (that is, a measure that has been added to the Values drop-zone) are those relevant to 1996 and not any other year or years This is the standard behavior of a measure Its values are governed by the filters you implement in the pivot table Measures have filter context As such, the values of a measure in a pivot table will often change as you slice and filter Measures are often said to be dynamic One of the most powerful aspects of DAX is the ability to alter the filter context at will The CALCULATE() function lets you add to or subtract from the existing filter context You can change or override the current filters or remove the filters completely If you remove the current filters completely, you are effectively turning a dynamic measure into a static, fixed measure In the example in the upcoming section Examples of Measures, the function ALL() modifies the CALCULATE() function to remove any current filter context on the Order Details table In plain words, this means that the value in any particular cell is unchanged no matter how you slice, dice, or filter the date Sometimes, overriding the filter context (totally or partially) is just what you need Sometimes, honoring the current filter is just what you need Later in this chapter, you ll see examples of both Hopefully, then, it will begin to make sense The filter context is one of the more difficult concepts in PowerPivot
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4: DAX: Overview
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Evaluation and Non-Materialization of a Measure
A measure is not evaluated until it is added to the Values drop-zone As you add columns to Column Labels and Row Labels and drill down and drill up, the measure gets re-evaluated for every single cell in the pivot table individually If you filter in these labels, in a Report Filter, and/or in a slicer, re-evaluation will occur The evaluations are not stored permanently in a PowerPivot table; they are never materialized This is another reason why measures as referred to as dynamic data
Where to Use a Measure in a Pivot Table
In the PowerPivot Field List, a calculated measure has a small calculator icon to distinguish it from normal and calculated columns You can only add the measure to the Values drop-zone You can t, for example, add it to Row Labels or to a slicer In 2, you saw just such a measure: DAXMeasure For those readers with an SSAS and cube background (and if you don t have this background, please feel free to skip this paragraph), a measure is a member of a measure group A measure is always an aggregation, and its value is determined by how you slice and dice (filter context) A measure in PowerPivot is always a measure You can t change it into a degenerate or fact dimension that s why it can only be added to the Values drop-zone in the field list and not to Column Labels, for example
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