Created
September 17, 2014 08:56
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m101js.hw5.4.js
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| db.zips.aggregate([ | |
| {$project: | |
| { | |
| first_char: {$substr : ["$city",0,1]}, | |
| pop: 1 | |
| } | |
| }, | |
| {$match: | |
| { | |
| first_char: {$lt: 'A'} | |
| } | |
| }, | |
| {$group: | |
| { | |
| _id: null, | |
| total: {$sum: '$pop'} | |
| } | |
| } | |
| ]) |
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