SELECT max(num_of_shops) ,  avg(Num_of_Factories) FROM manufacturer WHERE open_year  <  1990
what is the average number of factories and maximum number of shops for manufacturers that opened before 1990.
SELECT max ( num_of_shops ) , avg ( Num_of_Factories ) FROM manufacturer WHERE open_year < 1990
select max ( num_of_shops ) , avg ( num_of_factories ) from manufacturer where open_year < value
what is the average number of factories and maximum number of shops for manufacturers that opened before 1990 .