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hperantunes/m101p-hw5.4.js

Last active August 29, 2015 14:15
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m101p-hw5.4.js
db.zips.aggregate([
{$project: { _id: 1, city: 1, pop: 1, state: 1, first_char: {$substr : ["$city", 0, 1]} }},
{$match: {first_char: {$regex: '[0-9]'}}},
{$group: {_id: null, sum: {$sum: '$pop'}}}
])
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