What is the student_id of the lowest exam score above 65? Mongodb

Answer

db.grades.aggregate({ $match : { score : { $gte : 65 }, type:'exam' }}, { $group:{_id:'$student_id',count:{$sum: 1}, score :{ $min:'$score'}}}, {'$sort':{'score':1}}, {'$limit':1});

Mongo Aggregration example http://docs.mongodb.org/manual/tutorial/aggregation-examples/
http://docs.mongodb.org/manual/reference/aggregation/match/

grade.js

{ "_id" : { "$oid" : "50906d7fa3c412bb040eb577" }, "student_id" : 0, "type" : "exam", "score" : 54.6535436362647 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb578" }, "student_id" : 0, "type" : "quiz", "score" : 31.95004496742112 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb579" }, "student_id" : 0, "type" : "homework", "score" : 14.8504576811645 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57a" }, "student_id" : 0, "type" : "homework", "score" : 63.98402553675503 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57b" }, "student_id" : 1, "type" : "exam", "score" : 74.20010837299897 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57c" }, "student_id" : 1, "type" : "quiz", "score" : 96.76851542258362 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57d" }, "student_id" : 1, "type" : "homework", "score" : 21.33260810416115 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57e" }, "student_id" : 1, "type" : "homework", "score" : 44.31667452616328 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57f" }, "student_id" : 2, "type" : "exam", "score" : 19.88180838833524 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb580" }, "student_id" : 2, "type" : "quiz", "score" : 1.528220212203968 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb581" }, "student_id" : 2, "type" : "homework", "score" : 60.9750047106029 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb582" }, "student_id" : 2, "type" : "homework", "score" : 97.75889721343528 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb583" }, "student_id" : 3, "type" : "exam", "score" : 92.6244233936537 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb584" }, "student_id" : 3, "type" : "quiz", "score" : 82.59760859306996 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb585" }, "student_id" : 3, "type" : "homework", "score" : 50.81577033538815 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb586" }, "student_id" : 3, "type" : "homework", "score" : 92.71871597581605 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb587" }, "student_id" : 4, "type" : "exam", "score" : 87.89071881934647 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb588" }, "student_id" : 4, "type" : "quiz", "score" : 27.29006335059361 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb589" }, "student_id" : 4, "type" : "homework", "score" : 5.244452510818443 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb58a" }, "student_id" : 4, "type" : "homework", "score" : 28.656451042441 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb58b" }, "student_id" : 5, "type" : "exam", "score" : 49.41260067227861 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb58c" }, "student_id" : 5, "type" : "quiz", "score" : 24.88157329048566 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb58d" }, "student_id" : 5, "type" : "homework", "score" : 23.29430953857654 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb58e" }, "student_id" : 5, "type" : "homework", "score" : 41.21853026961924 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb58f" }, "student_id" : 6, "type" : "exam", "score" : 97.56302189646776 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb590" }, "student_id" : 6, "type" : "quiz", "score" : 28.69388067325539 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb591" }, "student_id" : 6, "type" : "homework", "score" : 81.23822046161325 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb592" }, "student_id" : 6, "type" : "homework", "score" : 89.72700715074382 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb593" }, "student_id" : 7, "type" : "exam", "score" : 24.94567271590522 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb594" }, "student_id" : 7, "type" : "quiz", "score" : 3.071378307459649 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb595" }, "student_id" : 7, "type" : "homework", "score" : 85.56691619291915 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb596" }, "student_id" : 7, "type" : "homework", "score" : 63.35102050393443 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb597" }, "student_id" : 8, "type" : "exam", "score" : 76.78123286903039 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb598" }, "student_id" : 8, "type" : "quiz", "score" : 54.07993751283986 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb599" }, "student_id" : 8, "type" : "homework", "score" : 66.42784200049636 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb59a" }, "student_id" : 8, "type" : "homework", "score" : 67.29005808579812 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb59b" }, "student_id" : 9, "type" : "exam", "score" : 58.66789709375767 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb59c" }, "student_id" : 9, "type" : "quiz", "score" : 67.75606311373502 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb59d" }, "student_id" : 9, "type" : "homework", "score" : 16.60130789148128 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb59e" }, "student_id" : 9, "type" : "homework", "score" : 75.29561445722392 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb59f" }, "student_id" : 10, "type" : "exam", "score" : 39.29353392707993 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a0" }, "student_id" : 10, "type" : "quiz", "score" : 4.73361119523118 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a1" }, "student_id" : 10, "type" : "homework", "score" : 6.094174990746648 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a2" }, "student_id" : 10, "type" : "homework", "score" : 59.8608006208505 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a3" }, "student_id" : 11, "type" : "exam", "score" : 40.67958752004213 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a4" }, "student_id" : 11, "type" : "quiz", "score" : 25.07755580237715 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a5" }, "student_id" : 11, "type" : "homework", "score" : 27.42742674795513 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a6" }, "student_id" : 11, "type" : "homework", "score" : 36.40445626804575 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a7" }, "student_id" : 12, "type" : "exam", "score" : 33.53240540641648 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a8" }, "student_id" : 12, "type" : "quiz", "score" : 42.1515791239878 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5a9" }, "student_id" : 12, "type" : "homework", "score" : 51.69676516705788 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5aa" }, "student_id" : 12, "type" : "homework", "score" : 82.77970287970591 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ab" }, "student_id" : 13, "type" : "exam", "score" : 80.28230979707159 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ac" }, "student_id" : 13, "type" : "quiz", "score" : 29.34832686614311 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ad" }, "student_id" : 13, "type" : "homework", "score" : 0.4838914493376478 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ae" }, "student_id" : 13, "type" : "homework", "score" : 20.43324935507571 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5af" }, "student_id" : 14, "type" : "exam", "score" : 93.38696333100664 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b0" }, "student_id" : 14, "type" : "quiz", "score" : 28.51098909885332 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b1" }, "student_id" : 14, "type" : "homework", "score" : 63.69676709320795 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b2" }, "student_id" : 14, "type" : "homework", "score" : 68.54514775914414 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b3" }, "student_id" : 15, "type" : "exam", "score" : 1.47782917177508 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b4" }, "student_id" : 15, "type" : "quiz", "score" : 33.87245622400884 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b5" }, "student_id" : 15, "type" : "homework", "score" : 18.41724574382455 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b6" }, "student_id" : 15, "type" : "homework", "score" : 7.475648374118382 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b7" }, "student_id" : 16, "type" : "exam", "score" : 40.92812784954744 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b8" }, "student_id" : 16, "type" : "quiz", "score" : 50.34242323656437 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5b9" }, "student_id" : 16, "type" : "homework", "score" : 28.83314472509642 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ba" }, "student_id" : 16, "type" : "homework", "score" : 12.8489522283682 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5bb" }, "student_id" : 17, "type" : "exam", "score" : 15.41965352054079 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5bc" }, "student_id" : 17, "type" : "quiz", "score" : 49.96929616916231 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5bd" }, "student_id" : 17, "type" : "homework", "score" : 32.33461505658801 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5be" }, "student_id" : 17, "type" : "homework", "score" : 46.60035010086104 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5bf" }, "student_id" : 18, "type" : "exam", "score" : 91.08706438561104 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c0" }, "student_id" : 18, "type" : "quiz", "score" : 75.40503201244346 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c1" }, "student_id" : 18, "type" : "homework", "score" : 41.85145793009654 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c2" }, "student_id" : 18, "type" : "homework", "score" : 16.31570053358192 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c3" }, "student_id" : 19, "type" : "exam", "score" : 19.81798820096837 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c4" }, "student_id" : 19, "type" : "quiz", "score" : 64.20132093742032 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c5" }, "student_id" : 19, "type" : "homework", "score" : 19.50958720409689 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c6" }, "student_id" : 19, "type" : "homework", "score" : 39.19179146514524 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c7" }, "student_id" : 20, "type" : "exam", "score" : 8.286466112754242 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c8" }, "student_id" : 20, "type" : "quiz", "score" : 92.76554684090782 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5c9" }, "student_id" : 20, "type" : "homework", "score" : 1.686348824521233 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ca" }, "student_id" : 20, "type" : "homework", "score" : 71.94442279826119 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5cb" }, "student_id" : 21, "type" : "exam", "score" : 75.29800347780863 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5cc" }, "student_id" : 21, "type" : "quiz", "score" : 63.80378988614874 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5cd" }, "student_id" : 21, "type" : "homework", "score" : 80.54060269630054 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ce" }, "student_id" : 21, "type" : "homework", "score" : 92.99367317085135 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5cf" }, "student_id" : 22, "type" : "exam", "score" : 65.02518811936324 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d0" }, "student_id" : 22, "type" : "quiz", "score" : 86.0800081592629 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d1" }, "student_id" : 22, "type" : "homework", "score" : 72.09706855281985 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d2" }, "student_id" : 22, "type" : "homework", "score" : 48.25372543033731 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d3" }, "student_id" : 23, "type" : "exam", "score" : 8.710615075792338 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d4" }, "student_id" : 23, "type" : "quiz", "score" : 20.31847063373616 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d5" }, "student_id" : 23, "type" : "homework", "score" : 25.96316667391913 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d6" }, "student_id" : 23, "type" : "homework", "score" : 96.85547653945963 }
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{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5d8" }, "student_id" : 24, "type" : "quiz", "score" : 90.07869851792576 }
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{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5df" }, "student_id" : 26, "type" : "exam", "score" : 92.67702875321054 }
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{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5e1" }, "student_id" : 26, "type" : "homework", "score" : 38.78833775925688 }
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{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5e3" }, "student_id" : 27, "type" : "exam", "score" : 56.40596524710979 }
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{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5e5" }, "student_id" : 27, "type" : "homework", "score" : 7.65403646299363 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5e6" }, "student_id" : 27, "type" : "homework", "score" : 9.088928055596712 }
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5e7" }, "student_id" : 28, "type" : "exam", "score" : 3.574134754746372 }
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{ "_id" : { "$oid" : "50906d7fa3c412bb040eb5ee" }, "student_id" : 29, "type" : "homework", "score" : 63.25343473329258 }
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