QUERY PLAN
"Nested Loop  (cost=1.10..6331.32 rows=1 width=84)"
"  ->  Nested Loop  (cost=1.10..6325.56 rows=1 width=62)"
"        ->  Nested Loop  (cost=1.10..6319.53 rows=1 width=70)"
"              Join Filter: ((""inner"".snumber = ""outer"".snumber) AND (""outer"".event_id = ""inner"".event_id))"
"              ->  Index Scan using speed_3 on history  (cost=0.00..393.33 rows=1 width=24)"
"                    Index Cond: (type_id = 6)"
"                    Filter: (undo_action_id IS NULL)"
"              ->  Hash Join  (cost=1.10..5822.46 rows=6916 width=54)"
"                    Hash Cond: (""outer"".field_id = ""inner"".field_id)"
"                    ->  Seq Scan on seats  (cost=0.00..4887.80 rows=172880 width=24)"
"                    ->  Hash  (cost=1.08..1.08 rows=8 width=46)"
"                          ->  Seq Scan on fields  (cost=0.00..1.08 rows=8 width=46)"
"        ->  Index Scan using i_action_id2 on actions  (cost=0.00..6.02 rows=1 width=8)"
"              Index Cond: (""outer"".action_id = actions.action_id)"
"              Filter: (((created)::date = '2005-02-24'::date) AND (user_id = 23))"
"  ->  Index Scan using events_pkey on events  (cost=0.00..5.75 rows=1 width=46)"
"        Index Cond: (""outer"".event_id = events.event_id)"