$gt

运算符 $gt 检索字段的值大于指定值的文档。 运算符 $gt 查询数值和日期值，以筛选超出指定阈值的记录。

Syntax

{
    field: {
        $gt: value
    }
}

参数

例子

请考虑商店集合中的这个示例文档。

{
    "_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
                }
            ]
        }
    ]
}

示例 1：检索销售额超过 $35,000 的商店

若要检索销售额超过 35,000 美元的商店，请先在 sales.totalSales 字段中运行包含 $gt 运算符的查询。 然后将查询结果限制为一个存储区。

db.stores.find({
    "sales.totalSales": {
        $gt: 35000
    }
}, {
    name: 1,
    "sales.totalSales": 1
}, {
    limit: 1
})

此查询返回的第一个结果为:

[
    {
        "_id": "2cf3f885-9962-4b67-a172-aa9039e9ae2f",
        "name": "First Up Consultants | Bed and Bath Center - South Amir",
        "sales": { "totalSales": 37701 }
    }
]

示例 2：查找拥有 12 多名全职员工的商店

若要查找具有 12 多名全职员工的商店，请首先在 staff.totalStaff.fullTime 字段中与 $gt 操作员运行查询。 然后仅投影名称和 totalStaff 字段，并将结果集限制为匹配结果列表中的单个存储。

db.stores.find({
    "staff.totalStaff.fullTime": {
        $gt: 12
    }
}, {
    name: 1,
    "staff.totalStaff": 1
}, {
    limit: 1
})

此查询返回的第一个结果为:

[
    {
        "_id": "2cf3f885-9962-4b67-a172-aa9039e9ae2f",
        "name": "First Up Consultants | Bed and Bath Center - South Amir",
        "staff": { "totalStaff": { "fullTime": 18, "partTime": 17 } }
    }
]

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