problem in group by

I have a table masterauthor which has columns as

AUTHOR NAME and ID ( ID is primary key )

and a second TABLE*(sellTable ) having the numbers books of the author which are sold

i mean the say that the all those authors whose books are being sold are entered in the second table

I have to display author's name and id from the forst list grouping the author who has sold the book once

Regards
Amin

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