====== How to rename medium or other columns ======


Sometimes the medium column needs to be renamed because the revenue and the spend do not match. 
Here we see an example for snapcht.

{{:advanced_transformations:medium_for_snapchat_not_matching.png?1000|}}


1. For this we need to rename the column so we click "Explore data"

{{:advanced_transformations:2021-09-01_11-17.png?1000|}}

2. Then we click "Edit dataset"
{{:advanced_transformations:2021-09-01_11-21.png?1000|}}

3. Then we click "Calculated Columns" and edit the case statement for Medium

{{:advanced_transformations:2021-09-01_11-25.png?1000|}}

In this case we add the rule for snapchat:

<code>WHEN source='snapchat' THEN 'paid_social' </code>

So the whole Expressions looks like:
<code>
Case when (source='facebook' and (medium='cpc' OR medium='Unknown')) THEN 'paid_social' 
WHEN source='criteo' THEN 'retargeting' 
WHEN (medium='Unknown' AND totalcost > 0) THEN 'cpc'
WHEN source='snapchat' THEN 'paid_social' 
ELSE medium END
</code>

4. Then we save and re-run the query and make sure its not coming from cache and then we have spend and revenue for snapchat on the same row and a multi-touch attributed ROAS.

{{:advanced_transformations:2021-09-01_11-31.png?1000|}}