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Agrupa e calcula a média com aggregate - MongoDB
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| db.zips.aggregate([ | |
| { | |
| $match: { | |
| $and : [ | |
| { $or: [ { state: 'XX' }, { state: 'YY' } ] }, { pop: {$gte: 25000}} | |
| ]} | |
| }, | |
| { | |
| $group: | |
| { | |
| _id: null, | |
| media: { $avg: '$pop'} | |
| } | |
| } | |
| ]) |
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db.zips.aggregate([
{
$match: {
$and : [
{ $or: [ { state: 'XX' }, { state: 'YY' } ] }, { pop: {$gte: 25000}}
]}
},
{
$group:
{
_id: null,
media: { $avg: '$pop'}
}
}
])