merge/combine columns with same name but incomplete data

Question

I have two data frames that have some columns with the same names and others with different names. The data frames look something like this:

df1
      ID hel         


        

Answer 1

@ananda-mahto 's answer is more elegant but here is my suggestion:

library(reshape2)
df1=melt(df1,id='ID',na.rm=TRUE)
df2=melt(df2,id='ID',na.rm=TRUE)
DF=rbind(df1,df2)
# Not needeed,  added na.rm=TRUE based on @ananda-mahto's valid comment
# DF<-DF[!is.na(DF$value),]
dcast(DF,ID~variable,value.var='value')