select 
    CASE (a.aa * 10 + b.bb)
        WHEN 0 THEN 'No more bottle of beer on the wall, no more bottles of beer. ' +
                   'Go to the store and buy some more, 99 bottles of beer on the wall.'
        WHEN 1 THEN '1 bottle of beer on the wall, 1 bottle of beer. ' +
                    'Take one down and pass it around, no