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db.products.aggregate([
    {
      $group:{
         _id:0,
         sum:{$sum:"$salary"},
         avg:{$avg:"$salary"},
         max:{$max:"$salary"},
         min:{$min:"$salary"},
         rows:{$sum:1},
         multi:{$avg:{$multiply:["$salary",2]}}
       }
    }
    
    ])