MongoDB - distinct and count, the simplest case -


i have database xxx , collection yyy in mongodb (using mongolab).

here sample record:

{  "_id": {     "$oid": "551a5asdfsdfsdfs"  },  "_class": "com.test.com",  "mvid": "d0fffsdfs"  }

i retrieve distinct values of field "mvid" , count them. here found on internet:

db.yyy.aggregate([{ $group: { _id: "$mvid"}  },{ $group: { _id: 1, count: { $sum: 1 } } }])

i tried 

xxx.yyy.aggregate([{ $group: { _id: "$mvid"}  },{ $group: { _id: 1, count: { $sum: 1 } } }])

i put above command text box, in both cases following error message: "we encountered error while parsing json. please check syntax (e.g. ensure using double quotes around both field names , values) , try again."

what doing wrong?

that command text box providing json-formatted parameters whatever command selected in drop-down. aggregate not 1 of listed commands, appears you'd need install mongodb shell locally , remotely connect mongolab database , run command.

see this blog post details on installing mongodb shell , connecting mongolab.


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