user: Question: Which opponent played a 1990 WCQ type of game, where the results were 0:0?
Columns: ['Date', 'City', 'Opponent', 'Results¹', 'Type of game']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['April 5', 'Athens , Greece', 'Greece', '4:1', 'Friendly']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Type of game" = '1990 WCQ' AND "Results¹" = '0:0';