Table: swimming_champs
Columns: event
time
swimmer
school
year

Question: What is Swimmer, when Year is less than 2011, and when Time is "53.06"?
SQL: SELECT "swimmer" FROM swimming_champs WHERE "year" < 2011 AND "time" = '53.06'

Question: What is School, when Event is "100 Backstroke"?
SQL: SELECT "school" FROM swimming_champs WHERE "event" = '100 backstroke'

Question: What is School, when Year is less than 2013, and when Event is "100 Breaststroke"?
SQL: SELECT "school" FROM swimming_champs WHERE "year" < 2013 AND "event" = '100 breaststroke'

Question: What is Time, when Year is greater than 2011, and when Event is "800 Freestyle Relay"?
SQL: SELECT "time" FROM swimming_champs WHERE "year" > 2011 AND "event" = '800 freestyle relay'

Question: What is Year, when Time is "1:47.55"?
SQL: SELECT "year" FROM swimming_champs WHERE "time" = '1:47.55'