Table: jhalak_dikhhla_jaa_seasons_2
Columns: season
season_premiere_date
season_finale_date
winner
1st_runner_up
2nd_runner_up

Question: Who won when mahesh manjrekar was the 2nd runner-up?
SQL: SELECT "winner" FROM jhalak_dikhhla_jaa_seasons_2 WHERE "2nd_runner_up" = 'mahesh manjrekar'

Question: When was the season finale of a show with season premiere on 12 December 2010?
SQL: SELECT "season_finale_date" FROM jhalak_dikhhla_jaa_seasons_2 WHERE "season_premiere_date" = '12 december 2010'