How many author published papers in the 'IEEE Computer' journal?
IEEE Computer refer to FullName; How many author published papers refer to COUNT(PaperAuthor.Name) where FullName = ’IEEE Computer’
SELECT COUNT(T2.Name) FROM Paper AS T1 INNER JOIN PaperAuthor AS T2 ON T1.Id = T2.PaperId INNER JOIN Journal AS T3 ON T1.JournalId = T3.Id WHERE T3.FullName = 'IEEE Computer'