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# All articles with 'NOT()' Tag

## CP028: How to tell business logic & rules to Excel?

Published on Jan 22, 2015 in Chandoo.org Podcast Sessions, Random

In the 28th session of Chandoo.org podcast, let’s figure out how to express business rules & logic to Excel.

### What is in this session?

What good are spreadsheets if they can’t solve business problems?

But we all struggle when it comes to modeling real world business conditions in Excel. For example, if you have below business rule to decide how much discount to offer a customer,

• If the customer bought 3 or more times previously and offer 15% discount
• If the customer bought 1 or 2 times previously AND customer’s age is >40, offer 10% discount
• If the customer visited our New York store between 6PM-9PM offer 5% discount
• Else no discount

How would you go about modeling these in Excel?

That is our topic for this podcast session.

In this podcast, you will learn

• The challenge of modeling business logic & rules in Excel
• My struggles with such formulas in early days
• 4 features of Excel that can help you with this.
• Example business rules & how to write formulas
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## Formula Forensics No. 030 – Extracting a Sorted, Unique List, Grouped by Frequency of Occurrence

Published on Oct 4, 2012 in Formula Forensics, Posts by Sajan

Today at Formula Forensics, Guest author Sajan shows us how to extract a sorted, unique list of items, displaying the most frequently occurring items first, while restricting the output based on some additional criteria.

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## Writing “Either Or” formula in Excel [Formula Howtos]

Published on Mar 2, 2010 in Excel Howtos, Learn Excel

We all know the AND, OR & NOT formulas in Excel using which you can perform simple logical operations And, Or & Negate. But what if you are the chief of HR at ACME Company, where they have a strange rule on extra allowance like this: Now, to calculate the dates in a month that […]

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