Table: athlete_results
Columns: athlete
class
event
bout_1
bout_2
bout_3
bout_4
bout_5
bout_6
rank
1_8_finals
quarterfinals
semifinals

Question: what were the result in semifinals when saengsawang ( tha ) l 9-15 was  in 1/8 finals?
SQL: SELECT "semifinals" FROM athlete_results WHERE "1_8_finals" = 'Saengsawang ( THA ) L 9-15'

Question: wich were the events when bout 2 was zhang ( chn ) l 0-5?
SQL: SELECT "event" FROM athlete_results WHERE "bout_2" = 'Zhang ( CHN ) L 0-5'

Question: Which were the bout 1 when the bout 5 was andreev ( rus ) w 5-2?
SQL: SELECT "bout_1" FROM athlete_results WHERE "bout_5" = 'Andreev ( RUS ) W 5-2'

Question: when Sanchez ( esp ) w 5-0 were the bout 6, which were the class?
SQL: SELECT "class" FROM athlete_results WHERE "bout_6" = 'Sanchez ( ESP ) W 5-0'