# Alteryx designer Discussions

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## Calculating Historical Date Differences

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8 - Asteroid

Hello,

I have the following Exit History data showing which year(s) an employee left the company. For this example, the assumption is that even though the employee left, they returned the next year and continued to work with the company until today. This can happen multiple times as it did with Tom.

 Name Exit Year Tom 2009 Tom 2011 Tom 2015 Sally 2010

I have a History table that shows the individual's data from 2007 to the present. Using that History table, I am trying to calculate how long it was from the year (RowYear) until their Exit.  Here is what I am trying to achieve:

 Name Row Year Years from Exit Tom 2007 2 Tom 2008 1 Tom 2009 0 Tom 2010 1 Tom 2011 0 Tom 2012 3 Tom 2013 2 Tom 2014 1 Tom 2015 0 Tom 2016 - Tom 2017 - Tom 2018 - Sally 2007 3 Sally 2008 2 Sally 2009 1 Sally 2010 0 Sally 2011 - Sally 2012 - Sally 2013 - Sally 2014 - Sally 2015 - Sally 2016 - Sally 2017 - Sally 2018 -

What would be the best way to do these calculations?

I tried the multi-row calculation and got pretty close, but the IF statement was getting unwieldy.

Thank you for the help.

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Alteryx Certified Partner

Here's how I would go about solving the problem, example workflow attached.

Ben

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13 - Pulsar

Here you go !

Highlighted
8 - Asteroid

Ben,

Thank you for sending this. It worked very well for me.

G

Highlighted
8 - Asteroid

Ponraj,

I really love this solution! It was clear and easy for me to understand.

Thank you!

G

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