What is the theme and artist name for the exhibition with a ticket price higher than the average?
return exhibitions ;return ticket prices of #1 ;return average of #2 ;return #1 where #2 is higher than #3 ;return theme of #4 ;return artist of #4 ;return name of #6 ;return #5 ,  #7
['select', 'project', 'aggregate', 'comparative', 'project', 'project', 'project', 'union']