###Introduction

As of Looker 3.28, we may use the `pivot_index`

function to compute a single calculation across the select pivoted columns. This function may also be used to extract a single column of values to display on the far right of the table.

###What is pivot_index?

The function itself provides us the ability to reference a specific column in the table using an indexed value. The index moves from left to right with the far most left column being an index = 1.

###How is this different than pivot_offset?

The function, pivot_offset, is a relation to the current column with offset x, while **pivot_index** is a relation to a specific column of the table as whole given an index = y . Essentially, offset works per column, while index works across an entire table.

###An Example

Let’s say I have a table of **Orders**, and within the **Orders** view I’ve computed whether or not each order was a first purchase, using an **Is First Purchase (Yes / No)** dimension. Subsequently, I’ve also computed the **Profit per User** in my **Orders** view, which I will intend to use grouped by **Orders Created Date**.

To form this report I will use **Orders Created Date** as my dimension, **Orders Is First Purchase (Yes / No)** as my pivot, and **Orders Profit per User** as my measure. Here is the table in its first pass state:

Now that we have our table, I would like to compute the **Total Profit per User** for each day. To do so, I’ll use a combination of the `round`

, `pivot_index`

, and `coalesce`

table calculation functions combined with an appropriate `Value Format`

.

Here is the result - notice how my calculation is displayed on the right edge of the table:

The calculation including the with relevant value format is as follows:

###How does this calcluation work?

First, I wanted to add the values from both columns together. To do so, I utilized **pivot_index** in the following calculation to add the values from the first column to the second column.

```
pivot_index(${orders.profit_per_user},1)+
pivot_index(${orders.profit_per_user},2)
```

This would suffice if there were no null values, but since there are null values, and adding nulls always results in a null, I need to **coalesce** both columns (for consistency).

```
coalesce(pivot_index(${orders.profit_per_user},1),0)+
coalesce(pivot_index(${orders.profit_per_user},2),0)
```

Finally, I wanted the values to round and look USD certified so I added the **round** function and a respective **Value Format**.

```
round(
coalesce(pivot_index(${orders.profit_per_user},1),0)+
coalesce(pivot_index(${orders.profit_per_user},2),0)
,2)
Value Format: $#00.00
```