Decode or translate with rollup

[Bonker]

how about query like this ?

select Writer, decode(groupid,1,cntname,null), summ from (SELECT nvl((a.name),'Total:') AS Writer count(DISTINCT a.name) cntname, count(b.isbn) AS Summ, grouping (a.name) groupid
FROM author a, book b
WHERE a.id = b.author_id
GROUP BY ROLLUP(a.name))

/