Funso (Chichewa): Ndi misika ingati yomwe yalemba mitengo ya mbewu zonse zomwe zilipo?
Question (English): How many markets have recorded prices for all available commodities?
Table: commodity_prices (difficulty: hard)
SQL: SELECT COUNT(*) FROM (SELECT market FROM commodity_prices GROUP BY market HAVING COUNT(DISTINCT commodity) = (SELECT COUNT(DISTINCT commodity) FROM commodity_prices));
Result: [(36,)]