$trunc

  • Berlaku untuk: ✅ Azure DocumentDB

Operator $trunc memotong angka ke tempat desimal tertentu.

Syntax

{
  $trunc: [ <number>, <decimal place> ]
}

Parameter-parameternya

Pengaturan Description
<number> Angka yang akan dipotong.
<decimal place> Digit desimal untuk mengurangi angka yang ditentukan. Nilai positif terpotong di sebelah kanan titik desimal, dan nilai negatif terpotong di sebelah kiri titik desimal.

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 - Mengambil koordinat lokasi yang telah dipangkas

Mengambil koordinat toko yang telah dipotong di dalam perusahaan "First Up Consultants", pertama-tama jalankan kueri untuk memfilter toko berdasarkan nama perusahaan. Kemudian, gunakan operator $trunc pada bidang lintang dan bujur untuk mengembalikan hasil yang diinginkan.

db.stores.aggregate([
  {
    $project: {
      truncatedLat: { $trunc: ["$location.lat", 2] }
    }
  }
])

Tiga hasil pertama yang dikembalikan oleh kueri ini adalah:

[
    {
        "_id": "39acb3aa-f350-41cb-9279-9e34c004415a",
        "name": "First Up Consultants | Bed and Bath Pantry - Port Antone",
        "location": {
            "lat": 87.2239,
            "lon": -129.0506
        },
        "truncatedLatitute": 87,
        "truncatedLongitude": -129
    },
    {
        "_id": "26afb024-53c7-4e94-988c-5eede72277d5",
        "name": "First Up Consultants | Microphone Bazaar - South Lexusland",
        "location": {
            "lat": -29.1866,
            "lon": -112.7858
        },
        "truncatedLatitute": -29,
        "truncatedLongitude": -112
    },
    {
        "_id": "62438f5f-0c56-4a21-8c6c-6bfa479494ad",
        "name": "First Up Consultants | Plumbing Supply Shoppe - New Ubaldofort",
        "location": {
            "lat": -0.2136,
            "lon": 108.7466
        },
        "truncatedLatitute": 0,
        "truncatedLongitude": 108
    }
]
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