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SUBSCRIBE FOR FREEMongoDB Basics: Less Than ($lt) and Less Than Equals ($lte)
In the world of database querying, being able to filter data based on specific ranges is essential. In this guide, we’ll learn how to find documents that fall below a certain value using MongoDB’s Less Than ($lt) and Less Than Equals ($lte) operators.
What do these operators do?
These comparison operators are used to compare numerical values, dates, and even strings. They allow you to fetch documents where a field is "smaller" than your target value.
- $lt (Less Than): Matches values that are strictly less than the specified value.
- $lte (Less Than or Equal To): Matches values that are less than or exactly equal to the specified value.
How to Write the Query
Using these operators in MongoDB is simple. Here is a basic example showing how to find products that cost less than 100 units:
price: { $lt: 100 }
})
If you want to include products that are exactly 100, just change the operator to $lte. This logic is widely used for creating price filters, inventory alerts, and date-based reports.
Why Learn This?
Understanding range queries is a fundamental building block for any backend developer. Whether you're building a simple app or a complex enterprise system, these operators help you present the most relevant data to your users.
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