user: Question: Which Competition has Opponents of PKNS FC, and a Score of 0-0?
Columns: ['Date', 'Venue', 'Opponents', 'Score', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['December 4, 2005', 'KLFA Stadium, Cheras', 'Sabah', '2-2', 'PL Group B']
SQL:

assistant: SELECT "Competition" FROM "Table" WHERE "Opponents" = 'PKNS FC' AND "Score" = '0-0';