#### Important Announcement:

Hi Brad - how do you get the one column to not display then (the % Diff Qt that has no data under it) I have a dataset that I need to work as follows:

Dec14 YTD Variance

A 20 32 12

B 15 21 6

What I get when I use your suggestion is more like:

Dec14 Variance YTD Variance

A 20 32 12

B 15 21 6

I need to remove the first Variance column?

**Published:**17 Jun

**Last Modified Date:**08 Jan

### Issue

How to create a calculation to find the difference between two values of the same measure in a view.For example, if the original view shows sales for 4 years, then the final view would show one column with the difference between sales for two specific years.

### Environment

Tableau Desktop### Resolution

The instructions for both options can be reviewed in the attached workbook.### Option 1

The below example compares sales between two years (e.g. sales - sales). Adjust the number at the end of the calculation to increase the difference in computation.- In Tableau Desktop, right-click the sheet name and select
**Duplicate sheet**. This will retain the view structure (such as YEAR on Columns and Measures on Text, etc). - Navigate to
**Analysis**>**Create calculated field** - Name the calculated field and enter a formula similar to the following: SUM([Sales]) - LOOKUP(ZN(SUM([Sales])), -2)
**Note:**-2 is calculated as “two cells previous”. If the data were viewed in a table, this means that the calculation will subtract the number two columns previous from the current column. If the view is changed from YEAR to QUARTER, this will change the result from 2 years previous to 2 quarters previous.

- Drag the new calculation to the view, replacing the original measure.

### To isolate one desired value for the calculation:

- Create a calculated field with a name like "Last Filter" with a calculation similar to the following: LAST() = 0
- Drag [Last Filter] to the Filters shelf
- In the Filter dialog, check True and click OK
- Right-click on Year, clear the
**Show Header**selection.

### Option 2

- Use the method in Isolating Dimension Members to Use in Calculations and Filters to create separate calculated for sales for each year
- Create a calculated field with a name like "Sales Difference (option 2)" with a calculation similar to the following: SUM([ Sales]) - SUM([ Sales])
- Drag [Sales Difference (option 2)] to Text on the Marks card

### Cause

For option 1, the quick table calculation Difference will show a difference in every column. A calculation to find the difference will also appear in every column, therefore a new view needs to be built to isolate the desired year.### Additional Information

Discuss this article

#### Important Announcement:

Sure! My pleasure!

See this is the calculated field which I've used to calculate the difference.

Here,

ZN() function replace null to zero, If found.

LOOKUP() function is the interesting part which doing your job

In the **Difference** table calculation, we want to compare a value against itself in a previous (or simply, a different) partition. Notice how the second value in the calculation is wrapped in a **LOOKUP()** function, which "looks" at the previous partition's value and then subtracts it from the next one, etc. The** -1** declares which partition is in relation to the base of the calculation.

Mahfooj

## How do I find the difference between the two columns in Tableau?

- Tableau FAQs
- December 13,

I have two columns that I am trying to find the difference from rather than the total. Can someone help me set up the formula?

To compare data from two fields and calculate the difference, you can use the LOOKUP function. Assuming you have data in fields for and , then you could use the following expression to find the difference:

**LOOKUP(** &#;Returns the value of the expression in a target row, specified as a relative offset from the current row. Use FIRST() + n and LAST() &#; n as part of your offset definition for a target relative to the first/last rows in the partition. If offset is omitted, the row to compare to can be set on the field menu. This function returns NULL if the target row cannot be determined.

** SUM([OrderQty])**, &#;here we specify data aggregation

** LAST())** &#; here we specify the offset

### Up Next:

Read **How to create a triple dual axis on a Tableau worksheet chart?**

## Two columns subtract tableau

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