Table: salina_kosgei_results
Columns: year
competition
venue
position
event

Question: Where was the London Marathon held?
SQL: SELECT "venue" FROM salina_kosgei_results WHERE "event" = 'marathon' AND "competition" = 'london marathon'

Question: In what years did Salina Kosgei compete in Singapore?
SQL: SELECT COUNT("year") FROM salina_kosgei_results WHERE "venue" = 'singapore'

Question: In what position did Salina Kosgei finish in the Tokyo Marathon?
SQL: SELECT "position" FROM salina_kosgei_results WHERE "competition" = 'tokyo marathon'