EXPLAIN select sum(l_extendedprice) / 7.0 as avg_yearly from lineitem, part where p_partkey = l_partkey and p_brand = 'Brand#55' and p_container = 'SM DRUM' and l_quantity < ( select 0.2 * avg(l_quantity) from lineitem where l_partkey = p_partkey );
                                                     QUERY PLAN                                                     
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 Aggregate  (cost=6865839.92..6865839.93 rows=1 width=4)
   ->  Nested Loop  (cost=0.56..6865792.47 rows=18980 width=4)
         ->  Seq Scan on part  (cost=0.00..70626.15 rows=2002 width=4)
               Filter: ((p_brand = 'Brand#55'::bpchar) AND (p_container = 'SM DRUM'::bpchar))
         ->  Index Scan using i_l_partkey on lineitem  (cost=0.56..3394.10 rows=9 width=12)
               Index Cond: (l_partkey = part.p_partkey)
               Filter: (l_quantity < (SubPlan 1))
               SubPlan 1
                 ->  Aggregate  (cost=117.12..117.14 rows=1 width=4)
                       ->  Index Scan using i_l_partkey on lineitem lineitem_1  (cost=0.56..117.05 rows=28 width=4)
                             Index Cond: (l_partkey = part.p_partkey)
(11 rows)