MongoDB $gt

Summary: in this tutorial, you will learn how to use the MongoDB $gt operator to select documents where the value of a field is greater than a specified value.

Introduction to the MongoDB $gt operator

The $gt operator is a comparison query operator that allows you to select documents where the value of a field is greater than (>) a specified value.

The following shows the syntax of the $gt operator:

{ field: { $gt: value}}
Code language: CSS (css)

MongoDB $gt operator example

We’ll use the following widget 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" : 9.7, "cpu" : 1.66 },"color":["white","orange","gold","gray"],"storage":[128,256]}
 ])
Code language: JavaScript (javascript)

1) Using $gt to select documents where the value of a field is greater than a specified value

The following example uses the $gt operator to select documents from the products collection where price is greater than 699:

db.products.find({
    price: {
        $gt: 699
    }
}, {
    name: 1,
    price: 1
})
Code language: CSS (css)

The query returned the following documents:

[
  { _id: 1, name: 'xPhone', price: 799 },
  { _id: 2, name: 'xTablet', price: 899 },
  { _id: 3, name: 'SmartTablet', price: 899 }
]
Code language: JavaScript (javascript)

2) Using the $gt operator to check if the value of a field in an embedded document is greater than a value

The following example uses $gt operator to select documents where the value of the ram field in the spec document is greater than 8:

db.products.find({
    "spec.ram": {
        $gt: 8
    }
}, {
    name: 1,
    "spec.ram": 1
});
Code language: PHP (php)

Output:

[
  { _id: 2, name: 'xTablet', spec: { ram: 16 } },
  { _id: 3, name: 'SmartTablet', spec: { ram: 12 } }
]
Code language: JavaScript (javascript)

3) Using the $gt operator to check if an array element is greater than a value

The following example uses the $gt operator to query the products collection to find all documents where the storage array has at least one element greater than 128:

db.products.find({
    storage: {
        $gt: 128
    }
}, {
    name: 1,
    storage: 1
})
Code language: CSS (css)

The query returned the following documents:

[
  { _id: 1, name: 'xPhone', storage: [ 64, 128, 256 ] },
  { _id: 2, name: 'xTablet', storage: [ 128, 256, 512 ] },
  { _id: 4, name: 'SmartPad', storage: [ 128, 256, 1024 ] },
  { _id: 5, name: 'SmartPhone', storage: [ 128, 256 ] }
]
Code language: JavaScript (javascript)

4) Using the $gt operator to check if the value of a field is after a date

The following example uses the $gt operator to query documents from the products collection to find all documents where the release date is after 2015-01-01:

db.products.find({
    "releaseDate": {
        $gt: new ISODate('2015-01-01')
    }
}, {
    name: 1,
    releaseDate: 1
});
Code language: PHP (php)

The query returned the following documents:

[
  {
    _id: 3,
    name: 'SmartTablet',
    releaseDate: ISODate("2015-01-14T00:00:00.000Z")
  },
  {
    _id: 4,
    name: 'SmartPad',
    releaseDate: ISODate("2020-05-14T00:00:00.000Z")
  },
  {
    _id: 5,
    name: 'SmartPhone',
    releaseDate: ISODate("2022-09-14T00:00:00.000Z")
  }
]
Code language: JavaScript (javascript)

Summary

• Use the $gt operator to select documents where a field is greater than a specified value.