Inner join:
Keep only when both datasets provide the data for the subject/row
merge(x=demographics, y=shipping,
by.x = name, by.y="name")
merge(x= demographics, y= shipping,
by="name")
#merge another way
#full join
kaz1<- merge(x=old,y=new,
by ="STUID", all=TRUE)
#left join
kaz2<- merge(x=old,y=new,
by ="STUID", all.x=TRUE)