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Power Pivot Principles: Tables, Fields and Measures

3 April 2018

Welcome back to our Power Pivot blog series, today let’s go over the syntax between a table, a field, and a measure.

 

Before we go into Data Analytics EXpressions (DAX), we first have to learn how to refer to a Table, a Field and a Measure in DAX.

Imagine that we have a table such as the following:

In DAX:

  • If the table above is called ‘Sales’ we would refer to it as ‘Sales’ in DAX
  • If we want to refer to any of the fields in this table, ‘Sales ID’ or ‘Sales Amount’, we would have to write it as ‘Sales[Sales ID]’, or ‘Sales[Sales Amount]’
  • If we create a measure (i.e. a formula which manipulates the aggregated summaries of one or more fields or other calculations) to calculate tax and call it ‘Sales Tax’, we will refer to it as [SalesTax] with square brackets around it.  The reference to a table is not required (and would be confusing) as calculations based upon fields are portable (i.e. they may be transferred from one table to another).

This may be summarised as follows:

That’s it for this week.  Stay tuned for our next post on Power Pivot.  In the meantime, please remember we have training in Power Pivot which you can find out more about here.  If you wish to catch up on past articles in the meantime, you can find all of our Past Power Pivot blogs here.

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