what should I do to see the data that exist just in one of the table data

[sebastingm1016]

hello everyone, I have a problem, I have just 2 tables,1 from inventory stock and 1 from the sales of the 3 last months, they have a relationship between the columns call "REFERENCE" and I just can see the references that are in  both of them, If the references has not been sold in the last 3 months so it is no possible for me to see their stock. somebody can give me a hand with that please, and thank you so much. 

[vicky_]

If there's a relationship between the two, then you can simply drag both onto the same matrix and the ones with blank values will be those that aren't in the first table. If there's no blanks, right click on one of them and make sure that "Show Items with No Data" is selected.