Discovering the minimum score in MongoDB

I have implemented a JavaScript program to find the lowest score and remove it from a collection.

var types=['exam','homework','quiz']
for (student_id = 0; student_id < 800; student_id++){
    for(type = 0; type < 3; type++){
        var r = {'student_id':student_id, 'type':types[type], 'minscore':{'$min':'$scores'}};
        db.scores.remove(r);
    }
}

However, I am encountering the following error:

WriteResult({
        "nRemoved" : 0,
        "writeError" : {
                "code" : 2,
                "errmsg" : "unknown operator: $min"
        }

Answer №1

If you're looking to retrieve specific data from MongoDB, this single line query is what you need.

db.scores.find({'student_id':student_id, 'type':types[type]}).sort({scores: 1}).limit(1);

Don't forget to create an index for all the fields being queried to ensure optimal performance.

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