mongodb query vs mysql - node.js

Question

I have the following MySQL query in which I have done sum profit which I have fields like: rate, credit(money)
SELECT SUM((credit*(100-rate))/100) FROM roznamcha WHERE (accountNum=$id AND rate!=0.0)'
I have written the following query in mongodb using node.js but it returns null whoever I have some data in my database
const profit=await roznamcha.aggregate([
{
$match:{
rate:{$ne:0}
}
},
{
$group:{
_id :'$accountNum',
}
},
{
$addFields:{
resultMultiply:{
$divide:[
{$multiply:['$credit','$rate-$100']},100
]
},
sumcredit:{
$sum:'$resultMultiply'
}
} }
])
res.status(201).json({
status:'success',
data:{
profit
}
})
My output:
{
"status": "success",
"data": {
"profit": [
{
"_id": "612deac8fbc8ef21a0fa4ea7",
"resultMultiply": null,
"sumcredit": 0
},
{
"_id": "612223327e2af83a4cec1272",
"resultMultiply": null,
"sumcredit": 0
}
]
}
my schema:
const mongoose = require('mongoose');
const roznamchaSchem=mongoose.Schema({
accountNum: {
type:mongoose.Schema.ObjectId,
ref:'account',
required: ['please specify this record is from who', true],
},
credit: {
type: Number,
default: 0
},
debit: {
type: Number,
default: 0
},
rate: {
type: Number,
default: 0
},
description:{
type:String,
required:['description can not be empty',true],
minlength: 8
},
issueDate:{
type: Date,
required:['add an valide date',true]
}
});
roznamchaSchem.index({accountNum:-1});
const Roznamcha=mongoose.model('roznamcha',roznamchaSchem);
module.exports=Roznamcha;
and my example of document:
id:612f533e8eb5533f303966e4
credit:50
debit:0
rate:2
accountNum:612deac8fbc8ef21a0fa4ea7
description:"this it for you"
issueDate:6543-01-01T00:00:00.000+00:00
can anyone guide me in solving this query?

Answer 1

Besides #Joe and #Nenad answer the error for the subtraction: '$rate-$100';
You need to re-position your logic structure.
Perform calculation: SUM((credit*(100-rate))/100).
Group by $accountNum and aggregate SUM for resultMultiply.
db.collection.aggregate([
{
$match: {
rate: {
$ne: 0
}
}
},
{
$addFields: {
resultMultiply: {
$divide: [
{
$multiply: [
"$credit",
{
"$subtract": [
100,
"$rate"
]
}
]
},
100
]
}
}
},
{
$group: {
_id: "$accountNum",
total: {
$sum: "$resultMultiply"
}
}
}
])
Output
[
{
"_id": 2,
"total": 1.5
},
{
"_id": 1,
"total": 5.5
}
]
Sample MongoDB playground

Answer 2

'$rate-$100' is referring to a field named "rate-$100". You probably meant to subtract using
{$subtract: [ 100, "$rate"]}

Answer 3

You can not use mathematical operator minus for substraction, you have to use $subtract aggregation operator.
resultMultiply: {
$divide: [{
$multiply: [
"$credit",
{ $subtract: [ 100, "$rate" ] }
]
},
100
]
}