CREATE TABLE table_49979 ("Minister" TEXT, "Party" TEXT, "Start date" TEXT, "End date" TEXT, "Prime Minister" TEXT)

What was the start date for the party of LSAP with a Prime Minister of Jean-Claude Juncker?
SELECT "Start date" FROM table_49979 WHERE "Party" = 'lsap' AND "Prime Minister" = 'jean-claude juncker'
SELECT "Start date" FROM "table_49979" WHERE "Party" = 'lsap' AND "Prime Minister" = 'jean-claude juncker'