MongoDB – Comparison Query Operators
Last Updated :
10 May, 2020
MongoDB uses various comparison query operators to compare the values of the documents. The following table contains the comparison query operators:
| Operators |
Description |
| $eq |
It is used to match the values of the fields that are equal to a specified value. |
| $ne |
It is used to match all values of the field that are not equal to a specified value. |
| $gt |
It is used to match values of the fields that are greater than a specified value. |
| $gte |
It is used to match values of the fields that are greater than equal to the specified value. |
| $lt |
It is used to match values of the fields that are less than a specified valueo |
| $lte |
It is used to match values of the fields that are less than equals to the specified value |
| $in |
It is used to match any of the values specified in an array. |
| $nin |
It is used to match none of the values specified in an array. |
In the following examples, we are working with:
Database: GeeksforGeeks
Collection: contributor
Document: three documents that contain the details of the contributors in the form of field-value pairs.
Matching values using $nin operator:
In this example, we are retrieving only those employee’s documents whose name is not Amit or Suman.
db.contributor.find({name: {$nin: ["Amit", "Suman"]}}).pretty()
|
Matching values using $in operator:
In this example, we are retrieving only those employee’s documents whose name is either Amit or Suman.
db.contributor.find({name: {$in: ["Amit", "Suman"]}}).pretty()
|
Matching values using $lt operator:
In this example, we are selecting those documents where the value of the salary field is less than 2000.
db.contributor.find({salary: {$lt: 2000}}).pretty()
|
Matching values using $eq operator:
In this example, we are selecting those documents where the value of the branch field is equal to CSE.
db.contributor.find({branch: {$eq: "CSE"}}).pretty()
|
Matching values using $ne operator:
In this example, we are selecting those documents where the value of the branch field is not equal to CSE.
db.contributor.find({branch: {$ne: "CSE"}}).pretty()
|
Matching values using $gt operator:
In this example, we are selecting those documents where the value of the salary field is greater than 1000.
db.contributor.find({salary: {$gt: 1000}}).pretty()
|
Matching values using $gte operator:
In this example, we are selecting those documents where the value of the joiningYear field is greater than equals to 2017.
db.contributor.find({joiningYear: {$gte: 2017}})
|
Matching values using $lte operator:
In this example, we are selecting those documents where the value of the salary field is less than equals to 1000.
db.contributor.find({salary: {$lte: 1000}}).pretty()
|
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