USE ssb1;
select sum(lo_extendedprice*lo_discount) as revenue 
from dateinfo, lineorder				   # changed order
where lo_orderdate = d_datekey
and d_year = 1993
and lo_orderdate between 19930101 and 19931231		   # added matching predicate
and lo_discount between 1  and 3
and lo_quantity < 25;
revenue
446031203850.0000