user: Question: When the other is N/A and the psc-pc is 30% what is the date?
Columns: ['Polling Firm', 'Date', 'PSD - PC', 'UDMR', 'Elena Băsescu', 'Others', 'Undecided']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Insomar', '26/03-05/04/2009', '31%', '7%', '6%', '1%', 'N/A']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Others" = 'N/A' AND "PSD - PC" = '30%';