Table: swim_results
Columns: event
time
nationality
date
meet
location

Question: What date was the 1500 m freestyle competition?
SQL: SELECT "date" FROM swim_results WHERE "event" = '1500 m freestyle'

Question: Where were the 2008 championships with a time of 7:56.90 held?
SQL: SELECT "location" FROM swim_results WHERE "meet" = '2008 championships' AND "time" = '7:56.90'