Beginners question, how to link two datasets which both contain sales data?

[monaldo12]

I have these two datasets that I want to link together.
Dataset 1 contains column units sales by specific EAN and Etailer in a specific week.
Dataset 2 contains customer ( = etailer), SAP sku (=EAN) and month (=actually week data as is dataset 1), unit sales sell in.

I want to combine this to one data source, do I need to make a specific key in both datasets to link them together and what would that be?

dataset 1:

dataset 2:

 

[jdellasala]

Please update your profile to indicate what version of Excel you're using and what OS. Also, please post data using XL2BB rather than screenshots, and more than just the header.
As for your question, one of the two tables has to have a column (or combination of columns) whose values are unique. Which table (dataset) are you looking to pull information into?