आप events में शामिल हो सकते हैं results . से दो प्रश्नों पर तालिका तालिका, प्रत्येक वर्ग के लिए एक:
SELECT event_data, class_40_winner, class_30_winner
FROM events e
LEFT JOIN (SELECT result_event, name AS class_40_winner
FROM results
WHERE class = 40 AND position = 1) c40 ON e.id = c40.result_event
LEFT JOIN (SELECT result_event, name AS class_30_winner
FROM results
WHERE class = 30 AND position = 1) c30 ON e.id = c30.result_event
