How many books did the main library have in 1884, plus the volumes held in the Main Building on the Ring?
return the  main library ;return the  Main Building on the   Ring ;return books in  1884 of #1 ;return volumes held of #2 ;return number of  #3 ;return number of  #4 ;return sum of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']