Table: swimming_2008_men_100butterfly
Columns: rank
lane
name
nationality
time

Question: Which nationality has a time of 50.92?
SQL: SELECT "nationality" FROM swimming_2008_men_100butterfly WHERE "time" = 50.92

Question: What is the time with fewer than 5 lanes for the United States?
SQL: SELECT SUM("time") FROM swimming_2008_men_100butterfly WHERE "lane" < 5 AND "nationality" = 'united states'