Hi, I want to combine two datasets. Here is an example of what i have:

Dataset A:
id Country Gender Income Education
1 E M 100 9
2 S F 100 10
3 V M 50 7
4 S M 90 8
Dataset B:
Contry Index
E 5
S 10
V 8
And i want two combine data set A with data set B with a new variable of the index by contry. Like this:
id Country Gender Income Education Index
1 E M 100 9 5
2 S F 100 10 10
3 V M 50 7 8
4 S M 90 8 10
Thank you