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$subtract

Operator $subtract digunakan untuk mengurangi dua angka dan mengembalikan hasilnya.

Syntax

{
  $subtract: [ <expression 1>, <expression 2> ]
}

Parameter-parameternya

Pengaturan Description
<expression 1> Minuend (angka dari mana angka lain akan dikurangi).
<expression 2> Subtrahend (angka yang akan dikurangi).

Examples

Pertimbangkan dokumen sampel ini dari koleksi toko.

{
    "_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
    "name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
    "location": {
        "lat": -89.2384,
        "lon": -46.4012
    },
    "staff": {
        "totalStaff": {
            "fullTime": 8,
            "partTime": 20
        }
    },
    "sales": {
        "totalSales": 75670,
        "salesByCategory": [
            {
                "categoryName": "Wine Accessories",
                "totalSales": 34440
            },
            {
                "categoryName": "Bitters",
                "totalSales": 39496
            },
            {
                "categoryName": "Rum",
                "totalSales": 1734
            }
        ]
    },
    "promotionEvents": [
        {
            "eventName": "Unbeatable Bargain Bash",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 6,
                    "Day": 23
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 7,
                    "Day": 2
                }
            },
            "discounts": [
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 7
                },
                {
                    "categoryName": "Bitters",
                    "discountPercentage": 15
                },
                {
                    "categoryName": "Brandy",
                    "discountPercentage": 8
                },
                {
                    "categoryName": "Sports Drinks",
                    "discountPercentage": 22
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 19
                }
            ]
        },
        {
            "eventName": "Steal of a Deal Days",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 21
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 29
                }
            },
            "discounts": [
                {
                    "categoryName": "Organic Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "White Wine",
                    "discountPercentage": 20
                },
                {
                    "categoryName": "Sparkling Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 17
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 23
                }
            ]
        }
    ]
}

Contoh 1: Menghitung perbedaan antara staf waktu penuh dan paruh waktu

Untuk menghitung perbedaan absolut antara staf paruh waktu dan penuh waktu di toko-toko dalam perusahaan "First Up Consultants", pertama-tama jalankan kueri untuk memfilter toko berdasarkan nama perusahaan. Kemudian, gunakan operator $diff bersama dengan operator $abs untuk menghitung perbedaan absolut antara staf waktu penuh dan paruh waktu untuk setiap toko.

db.stores.aggregate([{
    $match: {
        company: {
            $in: ["First Up Consultants"]
        }
    }
}, {
    $project: {
        name: 1,
        staff: 1,
        staffCountDiff: {
            $abs: {
                $subtract: ["$staff.employeeCount.fullTime", "$staff.employeeCount.partTime"]
            }
        }
    }
}])

Tiga hasil pertama yang dikembalikan oleh kueri ini adalah:

[
    {
        "_id": "62438f5f-0c56-4a21-8c6c-6bfa479494ad",
        "name": "First Up Consultants | Plumbing Supply Shoppe - New Ubaldofort",
        "staff": {
            "employeeCount": {
                "fullTime": 20,
                "partTime": 18
            }
        },
        "staffCountDiff": 2
    },
    {
        "_id": "bfb213fa-8db8-419f-8e5b-e7096120bad2",
        "name": "First Up Consultants | Beauty Product Shop - Hansenton",
        "staff": {
            "employeeCount": {
                "fullTime": 18,
                "partTime": 10
            }
        },
        "staffCountDiff": 8
    },
    {
        "_id": "14ab145b-0819-4d22-9e02-9ae0725fcda9",
        "name": "First Up Consultants | Flooring Haven - Otisville",
        "staff": {
            "employeeCount": {
                "fullTime": 19,
                "partTime": 10
            }
        },
        "staffCountDiff": 9
    }
]

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