Table: eurovision_commentators_2
Columns: year_s
grand_final_television_commentator
grand_final_dual_television_commentator
spokesperson
semi_final_television_commentator
semi_final_dual_television_commentator

Question: What is the semi-final dual television commentator status of the year with Pierre Tchernia as the grand final television commentator and an unknown spokesperson?
SQL: SELECT "semi_final_dual_television_commentator" FROM eurovision_commentators_2 WHERE "grand_final_television_commentator" = 'pierre tchernia' AND "spokesperson" = 'unknown'

Question: What is the semi-final television commentator status in 1962 with an unknown spokesperson?
SQL: SELECT "semi_final_television_commentator" FROM eurovision_commentators_2 WHERE "spokesperson" = 'unknown' AND "year_s" = 1962

Question: What is the grand final television commentator status after 1959 when Dave was the grand final dual television commentator and Marie Myriam was the spokesperson?
SQL: SELECT "grand_final_television_commentator" FROM eurovision_commentators_2 WHERE "year_s" > 1959 AND "grand_final_dual_television_commentator" = 'dave' AND "spokesperson" = 'marie myriam'

Question: What is the grand final dual television commentator status of the year when Amaury Vassili was the spokesperson?
SQL: SELECT "grand_final_dual_television_commentator" FROM eurovision_commentators_2 WHERE "spokesperson" = 'amaury vassili'