Table: olympic_speed_skating_records
Columns: event
time
name
nation
games
date

Question: What country did Chris Witty represent?
SQL: SELECT "nation" FROM olympic_speed_skating_records WHERE "name" = 'chris witty'

Question: On what day was the record set at the 2002 Salt Lake City games with a time of 3:57.70?
SQL: SELECT "date" FROM olympic_speed_skating_records WHERE "games" = '2002 salt lake city' AND "time" = '3:57.70'

Question: Who set the record in the 500 metres event?
SQL: SELECT "name" FROM olympic_speed_skating_records WHERE "event" = '500 metres'