Table: swimming_2008_men_100m
Columns: heat
lane
name
nationality
time

Question: What is the time in a heat smaller than 5, in Lane 5, for Vietnam?
SQL: SELECT "time" FROM swimming_2008_men_100m WHERE "heat" < 5 AND "lane" = 5 AND "nationality" = 'vietnam'

Question: What is the smallest lane number of Xue Ruipeng?
SQL: SELECT MIN("lane") FROM swimming_2008_men_100m WHERE "name" = 'xue ruipeng'