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Jan 21st, 2019
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  1. db.table.aggregate([{
  2. $group: {
  3. _id: null,
  4. total: {
  5. $sum: {
  6. $cond: [{ $and: [{ $gte: ["$a", 10] }, { $lte: ["$a", 100] }] }, "$a", 0 ]
  7. }
  8. }
  9. }
  10. }])
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