user: Question: When was the opponent Poland and the match type EC -qualifier?
Columns: ['Date', 'Location', 'Opponenent', 'Result', 'Match type']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['29 March 2000', 'Debrecen', 'Poland', '0-0 (draw)', 'friendly']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponenent" = 'Poland' AND "Match type" = 'EC -qualifier';