Table: golf_results_4
Columns: date
tournament
winning_score
to_par
margin_of_victory
runner_up

Question: A tournament on which date has a margin of victory of 2 strokes and a par of −16?
SQL: SELECT "date" FROM golf_results_4 WHERE "margin_of_victory" = '2 strokes' AND "to_par" = '−16'

Question: Who was the runner-up in the tournament that has a margin of victory of 2 strokes, and a To par of −16?
SQL: SELECT "runner_up" FROM golf_results_4 WHERE "margin_of_victory" = '2 strokes' AND "to_par" = '−16'

Question: What was the to par of the tournament that had Ken Duke as a runner-up?
SQL: SELECT "to_par" FROM golf_results_4 WHERE "runner_up" = 'ken duke'

Question: What was the margin of victory when Brandt Snedeker was runner-up?
SQL: SELECT "margin_of_victory" FROM golf_results_4 WHERE "runner_up" = 'brandt snedeker'

Question: What is the date that has a winning score of 67-70-68-67=272?
SQL: SELECT "date" FROM golf_results_4 WHERE "winning_score" = '67-70-68-67=272'