$nin
The $nin operator retrieves documents where the value of a field doesn't match a list of values
$nin
The $nin operator retrieves documents where the value of a specified field doesn't match a list of values.
Parameters
| Parameter | Description |
|---|---|
field | The field to compare |
[<listOfValues>] | An array of values that shouldn't match the value of the field being compared |
Examples
Consider this sample document from the stores collection.
{
"_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
}
]
}
]
}Example 1 - Find a store with a discount that isn't 10%, 15%, or 20%
To find a store with promotions offering discounts that are not 10%, 15%, or 20%, first run a query using $nin on the nested discountPercentage field. Then project only the name and discount offered by the result store and limit the result to a single document from the result set.
db.stores.find({
"promotionEvents.discounts.discountPercentage": {
$nin: [10, 15, 20]
}
}, {
name: 1,
"promotionEvents.discounts.discountPercentage": 1
}, {
limit: 1
})The first result returned by this query is:
[
{
"_id": "2cf3f885-9962-4b67-a172-aa9039e9ae2f",
"name": "First Up Consultants | Bed and Bath Center - South Amir",
"promotionEvents": [
{
"discounts": [
{ "discountPercentage": 18 },
{ "discountPercentage": 17 },
{ "discountPercentage": 9 },
{ "discountPercentage": 5 },
{ "discountPercentage": 5 },
{ "discountPercentage": 6 },
{ "discountPercentage": 9 },
{ "discountPercentage": 5 },
{ "discountPercentage": 19 },
{ "discountPercentage": 21 }
]
}
]
}
]Example 2 - Find a store with no discounts on specific categories of promotions
To find a store without promotions on Smoked Salmon and Anklets, first run a query using $nin on the nested categoryName field. Then project the name and promotions offered by the store and limit the results to one document from the result set.
db.stores.find({
"promotionEvents.discounts.categoryName": {
$nin: ["Smoked Salmon", "Anklets"]
}
}, {
name: 1,
"promotionEvents.discounts.categoryName": 1
}, {
limit: 1
})The first result returned by this query is:
[
{
"_id": "2cf3f885-9962-4b67-a172-aa9039e9ae2f",
"name": "First Up Consultants | Bed and Bath Center - South Amir",
"promotionEvents": [
{
"discounts": [
{ "categoryName": "Bath Accessories" },
{ "categoryName": "Pillow Top Mattresses" },
{ "categoryName": "Bathroom Scales" },
{ "categoryName": "Towels" },
{ "categoryName": "Bathrobes" },
{ "categoryName": "Mattress Toppers" },
{ "categoryName": "Hand Towels" },
{ "categoryName": "Shower Heads" },
{ "categoryName": "Bedspreads" },
{ "categoryName": "Bath Mats" }
]
}
]
}
]