Created
September 11, 2014 06:24
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hw5.4
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| db.zips.aggregate([ | |
| {$project: {first_char: {$substr : ["$city",0,1]}, pop:1}}, | |
| {$match:{"first_char":{"$regex": "[0-9]"}}}, | |
| {$group:{"_id":null, sum: {"$sum": "$pop"}}} | |
| ]) |
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