pvoznenko · September 11, 2014 06:24
diff --git a/hw5.4.js b/hw5.4.js
 db.zips.aggregate([
    {$project: {first_char: {$substr : ["$city",0,1]}, pop:1}}, 
    {$match:{"first_char":{"$regex": "[0-9]"}}},
    {$group:{"_id":null, sum: {"$sum": "$pop"}}}
 ])
	db.zips.aggregate([
	{$project: {first_char: {$substr : ["$city",0,1]}, pop:1}},
	{$match:{"first_char":{"$regex": "[0-9]"}}},
	{$group:{"_id":null, sum: {"$sum": "$pop"}}}
	])