基于唯一对组合将列从一个文件合并到另一个文件

I need to merge the "value" column of the File 2 to the File 1 in such a way that the col1-col2 unique pair combination remains intact.unmatched ones can be skipped. I am a newbie to python/awk. So, I need guidelines or ideas to solve the problem. I need to merge the "value" column of the File