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August 29, 2015 13:57
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| $project: { | |
| year: { $year: '$time'}, | |
| month: { $month: '$time'}, | |
| day: { $dayOfMonth: '$time'}, | |
| hour: { $hour: '$time'}, | |
| price: 1, | |
| volume: 1, | |
| } |
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