1 of 1 people found this helpful
You join data using years and want to see same countries. It won't happen. As I understand there can be several countries in one year. So there will be mess. You have two options:
1) Add additional join keys;
2) Add other data source as new data source and make corresponding relationships.
Both this options depend on what you want from data.
Trust this helps.
Thanks a lot for your helps. I will try. >.<