Summary: in this tutorial, you will learn how to use the MongoDB $lte
operator to select documents where the value of a field is less than or equal to a specified value.
Introduction to the MongoDB $lte operator
The $lte
is a comparison query operator that allows you to select documents where the value of a field is less than or equal to ( <=
) a specified value.
The following shows the $lte
syntax:
{field: {$lte: value} }
MongDB $lte operator examples
We’ll use the following products
collection:
db.products.insertMany([
{ "_id" : 1, "name" : "xPhone", "price" : 799, "releaseDate": ISODate("2011-05-14"), "spec" : { "ram" : 4, "screen" : 6.5, "cpu" : 2.66 },"color":["white","black"],"storage":[64,128,256]},
{ "_id" : 2, "name" : "xTablet", "price" : 899, "releaseDate": ISODate("2011-09-01") , "spec" : { "ram" : 16, "screen" : 9.5, "cpu" : 3.66 },"color":["white","black","purple"],"storage":[128,256,512]},
{ "_id" : 3, "name" : "SmartTablet", "price" : 899, "releaseDate": ISODate("2015-01-14"), "spec" : { "ram" : 12, "screen" : 9.7, "cpu" : 3.66 },"color":["blue"],"storage":[16,64,128]},
{ "_id" : 4, "name" : "SmartPad", "price" : 699, "releaseDate": ISODate("2020-05-14"),"spec" : { "ram" : 8, "screen" : 9.7, "cpu" : 1.66 },"color":["white","orange","gold","gray"],"storage":[128,256,1024]},
{ "_id" : 5, "name" : "SmartPhone", "price" : 599,"releaseDate": ISODate("2022-09-14"), "spec" : { "ram" : 4, "screen" : 5.7, "cpu" : 1.66 },"color":["white","orange","gold","gray"],"storage":[128,256]}
])
1) Using $lte operator to select documents where the value of a field is less than or equal to a specified value
The following example uses the $gt
e operator to select documents from the products
collection where price
is less than 799:
db.products.find({
price: {
$lte: 799
}
}, {
name: 1,
price: 1
})
Output:
{ "_id" : 1, "name" : "xPhone", "price" : 799 }
{ "_id" : 4, "name" : "SmartPad", "price" : 699 }
{ "_id" : 5, "name" : "SmartPhone", "price" : 599 }
2) Using the $lte operator to check if the value of a field in an embedded document is less than or equal to a value
The following query uses $lte
operator to select documents where the value of the screen
field in the spec
document is less than or equal to 6.5
:
db.products.find({
"spec.screen": {
$lte: 6.5
}
}, {
name: 1,
"spec.screen": 1
})
Output:
{ "_id" : 1, "name" : "xPhone", "spec" : { "screen" : 6.5 } }
{ "_id" : 5, "name" : "SmartPhone", "spec" : { "screen" : 5.7 } }
3) Using the $lte operator to check if an array element is less than or equal to a value
The following example uses the $lte
operator to query the products
collection to find all documents where the array storage
has at least one element less than or equal to 64:
db.products.find({
storage: {
$lte: 64
}
}, {
name: 1,
storage: 1
})
The query returned the following documents:
{ "_id" : 1, "name" : "xPhone", "storage" : [ 64, 128, 256 ] }
{ "_id" : 3, "name" : "SmartTablet", "storage" : [ 16, 64, 128 ] }
4) Using the $lte operator to check if the value of a field is before or on the same date
The following query uses the $lte
operator to select documents from the products
collection to find all documents where the release date is before or on 2015-01-11
:
db.products.find({
"releaseDate": {
$lte: new ISODate('2015-01-01')
}
}, {
name: 1,
releaseDate: 1
});
The query returned the following documents:
{ "_id" : 1, "name" : "xPhone", "releaseDate" : ISODate("2011-05-14T00:00:00Z") }
{ "_id" : 2, "name" : "xTablet", "releaseDate" : ISODate("2011-09-01T00:00:00Z") }
Summary
- Use the
$lte
operator to select documents where the value of a field is less than or equal to a specified value.