अगर स्टेटमेंट के साथ एसक्यूएल क्वेरी

मैं क्वेरी इस तरह लिखूंगा:

SELECT o.name AS offer, COUNT(c.id) AS clicks, 
  SUM( IF(c.conversionDate IS NOT NULL, o.commission, NULL) ) AS revenue 
FROM offers o JOIN clicks c ON (c.offerID=o.ID)
GROUP BY o.ID;

यहां एक और समाधान है, लेकिन ऐसे ऑफ़र हैं जिनमें कोई नहीं है रूपांतरित क्लिक क्वेरी परिणाम में नहीं दिखाए जाते:

SELECT o.name AS offer, COUNT(c.id) AS clicks, 
  SUM(o.commission) AS revenue 
FROM offers o JOIN clicks c 
  ON (c.offerID=o.ID AND c.conversionDate IS NOT NULL)
GROUP BY o.ID;