CREATE TABLE "table1_19398910_4" (
  "athlete" text,
  "class" text,
  "event" text,
  "bout_1" text,
  "bout_2" text,
  "bout_3" text,
  "bout_4" text,
  "bout_5" text,
  "bout_6" text,
  "rank" text,
  "1_8_finals" text,
  "quarterfinals" text,
  "semifinals" text
);

Question: what were the result in semifinals when saengsawang ( tha ) l 9-15 was  in 1/8 finals?
SQL: SELECT "semifinals" FROM "table1_19398910_4" 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 "table1_19398910_4" 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 "table1_19398910_4" 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 "table1_19398910_4" WHERE "bout_6"='Sanchez ( ESP ) W 5-0';