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: JSON / JSON with Comments (json)

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: JSON / JSON with Comments (json)

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: JSON / JSON with Comments (json)

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("2015-01-14T00:00:00Z") } { "_id" : 4, "name" : "SmartPad", "releaseDate" : ISODate("2020-05-14T00:00:00Z") } { "_id" : 5, "name" : "SmartPhone", "releaseDate" : ISODate("2022-09-14T00:00:00Z") }
Code language: JSON / JSON with Comments (json)

Summary

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