Table: olympic_bids_2012
Columns: city
round_1
round_2
round_3
round_4

Question: Round 3 with less than 54 for Round 4?
SQL: SELECT "round_3" FROM olympic_bids_2012 WHERE "round_4" = '54'

Question: Round 4 for larger than 19 Round 1 and a 27 Round 2?
SQL: SELECT "round_4" FROM olympic_bids_2012 WHERE "round_1" > 19 AND "round_2" = '27'

Question: Round 3 with a round 4 of 50?
SQL: SELECT "round_3" FROM olympic_bids_2012 WHERE "round_4" = '50'