Table: dwts_season6
Columns: dance
best_dancer_s
best_score
worst_dancer_s
worst_score

Question: What is the dance that has priscilla presley is the worst dancer(s), and the worst score of 21?
SQL: SELECT "dance" FROM dwts_season6 WHERE "worst_dancer_s" = 'priscilla presley' AND "worst_score" = '21'

Question: What is the best score of the dance freestyle?
SQL: SELECT "best_score" FROM dwts_season6 WHERE "dance" = 'freestyle'

Question: Which dance has the worst dancer(s) as marissa jaret winokur?
SQL: SELECT "dance" FROM dwts_season6 WHERE "worst_dancer_s" = 'marissa jaret winokur'