mysql - Symfony2 DQL Select Sum of Grouped By on ManyToMany -

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मेरे पास निम्न प्रश्न हैं: 

  चुनें DISTINCT l.id, cl.id, महीने के रूप में महीना, महीना (एलएडेट) के रूप में एमएएनएसटी (एलएडेट), एसओएम (एलएचओआरएलपीआरआईसीई * (TIME_TO_SEC (TIMEDIFF (एलएंड, एल। स्टार्ट)) / 3600) .समाचारकर्ता एस जॉइन एस.एल.एन. सीएल ग्रुप द्वारा सीएलआईडी, महीना, वर्ष   
 समस्या यह है कि प्रत्येक सबक में कई छात्र हो सकते हैं, प्रत्येक एक के लिए यह सबक प्राइस जोड़ता है ( अर्थात् सबक वैल्यू 100 है, 1 विद्यार्थी के साथ यह 100 जोड़ता है, लेकिन 3 छात्रों के साथ यह 100 के बजाय 300 जोड़ता है), इसलिए मुझे लगता है कि मैं गलत स्थान पर DISTINCT डाल रहा हूं। कोई विचार? 
 
 संपादित करें: 
 
 यह मिला:। बहुत ही एसक्यूएल उदाहरण है, लेकिन इसे लागू करने के लिए कोई भाग्य नहीं था।


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