inserting values for null

I have a dataframe D.F1

dim (D.F1) 

14351 9 
This dataframe has values and for some 1000 rows it holds NULL values.I hace
found the missing values for about 500 and have those in another dataframe
D.F.sub.2

dim(D.F.sub.2) 

500 9 
as dataframe is a subset of D.F1 the coulmn 1 in D.F.sub.2 is a subset of
D.F1.I have to insert the values in D.F1 in other fields while the coulmn 1
in both the main table and sub table matches. 
Ih short i have to insert a dataframe (D.F.sub.2) into the main D.F1 using
the column1 that hold similar values. 

Kindly plz help me.

Ramya

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