I've got two data.frames and, when certain "keys" match,  I would like to add 
the column values from one data frame to the other data.frame.

Below I list the two data.frames, i.e. neighborhoodInfo_df, and schoolZone_df.  
Based on the "address" key I would like to add the "schoolZone" key to the 
neighborhoodInfo_df data.frame.  

By any chance is there an R command to accomplish this in one or two steps.  I 
think I could do this in a "for" loop or something, but think there is might be 
another way in R to accomplish it smarter.  

Thanks for any info.  


neighborhoodInfo1_df<-data.frame(address<-c(101),squareFootage<-c(2000),lotsize<-c(0.75))

neighborhoodInfo2_df<-data.frame(address<-c(108),squareFootage<-c(3000), 
lotsize<-c(1.25))

neighborhoodInfo_df<-rbind(neighborhoodInfo1_df, neighborhoodInfo2_df)
                                                            
                                                            
schoolZone1_df<-data.frame(address<-c(101), schoolZone<-c("Sherman"))
                                                  
schoolZone2_df<-data.frame(address<-c(108), schoolZone<-c("Baker"))             
                        
          
schoolZone_df<-rbind(schoolZone1_df, schoolZone2_df)

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