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March 31, 2013 22:18
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Curso MongoDB Java - Week5 - HW5-3
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| db.grades.aggregate([{$unwind:"$scores"}, {$match:{$or:[{"scores.type":"homework"}, {"scores.type":"exam"}]}}, {$group:{_id:{student_id:"$student_id", class_id:"$class_id"}, avg_score:{$avg:"$scores.score"}}}, {$group:{_id:"$_id.class_id", avg_score_class:{$avg:"$avg_score"}}}, {$sort:{avg_score_class:1}}]) |
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