user: Question: What is the Date that has MARTIN of 7–9% and no Undecided?
Columns: ['Source', 'Date', 'MARTIN', 'GRÜNE', 'Others', 'Undecided']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Gallup/Österreich', '2009-06-02', '12–14%', '8–10%', '–', '–']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Undecided" = '–' AND "MARTIN" = '7–9%';