MongoDB – $lt Operator

MongoDB $lt operator or less than operator is one of the comparison operators. The $lt operator selects the documents with a value less than (<) the given value.

You can use this operator in methods like, find(), update(), etc. as per your requirements.

Syntax

{field: {$lt: value}}

MongoDB $lt Operator Example

In the following examples, we are working with:

Database: GeeksforGeeks

Collection: employee

Document: four documents that contain the details of the employees in the form of field-value pairs.

Example 1

In this example, we are selecting those documents where the value of the salary field is less than 35000.

Query:

find({salary: {lt:35000}}).pretty()

Output:

Example 2:

In this example, we are selecting only those documents where the age of the employee is less than 24.

Example 3:

In this example, we are selecting only those documents where the points array is less than the specified array.

Example 4:

In this example, we are updating the salary of those employees whose experience year is less than 2 years.

Key Takeaways About $lt Operator

• MongoDB $lt operator also known as less than operator is a comparison operator.
• It selects the documents where value of specific field is less than the given value.
• It can only compare similar data types. for example, string data type can not be compared with integer.
• It is useful for filtering wide range of documents.