Created
October 8, 2013 07:40
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MongoDB university M101P HW5.3
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| db.stud.aggregate([ | |
| {$match:{"scores.type":{$in:["exam","homework"]}}}, | |
| {$unwind:"$scores"}, | |
| {$group:{_id:"$class_id",csall:{$avg:"$scores.score"}}}, | |
| {$sort:{csall:-1}}, | |
| {$limit:5} | |
| ] | |
| ) |
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