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# MDX Utility Belt of Calculations Part 2

This post is a part of a series of blog posts I am writing to give you a Batman-like Utility Belt of MDX calculations.  With this Utility Belt available you can have a template of commonly needed calculations you can use for just about any Analysis Services project.

In part one of this series I showed how you could use the function ParallelPeriod to return sales from the previous year at all levels (Year, Quarter, Month).

In this series I present the business problem, a general solution, and the calculation to solve that problem.

Problem

To show the sales for the previous date member.  (Ex.  Show the sales for the last year, last quarter, or last month)

Solution

Using a function called PrevMember you can return the value of previous member.

Calculations

The sales for the previous year

([Date].[Year].PrevMember,[Measures].[Sales Amount])

---------------------------------------------------------------

The sales for the previous quarter

([Date].[Quarter].PrevMember,[Measures].[Sales Amount])

---------------------------------------------------------------

The sales for the previous month

([Date].[Month].PrevMember,[Measures].[Sales Amount])

## Devin Knight

Devin is a BI consultant at Pragmatic Works Consulting. Previously, he has tech edited the book Professional Microsoft SQL Server 2008 Integration Services and was an author in the book Knight's 24-Hour Trainer: Microsoft SQL Server 2008 Integration Services. Devin has spoken at past conferences like PASS and at several SQL Saturday events. He is a contributing member to the Business Intelligence Special Interest Group (SIG) for PASS as a leader in the SSIS Focus Group. Making his home in Jacksonville, FL, Devin is a participating member of the local usersâ€™ group (JSSUG).

##### Posted by Paul Mak-346751 on 7 December 2009

Is there a MDX function if I want to find out on a given date, how many unique customer for the past 2 years? Also how many are new or repeat customers for the past 2 years?

Thanks.

##### Posted by knight_devin@hotmail.com on 11 December 2009

Yeah it sounds like you may want to use the lag function.  SELECT

[Measures].[Internet Sales Amount] on 0,

[Ship Date].[Calendar Year].[All Periods].LastChild.Lag(1)

on 1