Table: dwtstars_season7_2
Columns: date
round
pair
ages
dance
song

Question: How old were Mitchell & Jessica when they danced the Cha-Cha-Cha?
SQL: SELECT "ages" FROM dwtstars_season7_2 WHERE "dance" = 'cha-cha-cha' AND "pair" = 'mitchell & jessica'

Question: Who danced the Cha-Cha-Cha on November 18, 2008?
SQL: SELECT "pair" FROM dwtstars_season7_2 WHERE "dance" = 'cha-cha-cha' AND "date" = 'november 18, 2008'

Question: Who danced the Samba on October 14, 2008?
SQL: SELECT "pair" FROM dwtstars_season7_2 WHERE "date" = 'october 14, 2008' AND "dance" = 'samba'