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MongoDB: The Complete Guide

Read Documents: Part 2

Explore how to use MongoDB comparison and logical query operators to filter documents effectively. Learn to apply operators such as $gt, $gte, $lt, $lte, $in, $ne, and $nin to fetch, exclude, or match documents based on field values. This lesson helps you build precise queries for reading data in MongoDB collections.

We'll cover the following...

＄gt: Greater than (>)

The ＄gt operator is used to match documents that have a field value greater than provided value.

Let’s insert some tasks with a numeric field value.

Markdown
db.tasks.insertMany([
{
  name: 'Task 1',
  priority: 1,
},
{
  name: 'Task 2',
  priority: 2,
}
]);

Next, we build a query to fetch tasks that have a greater priority than 1.

db.tasks.find({
    priority: {
        $gt: 1,
    },
});

This query returns the below output.

[
  {
    _id: ObjectId("60f98f8dac3c9ea06c0506aa"),
    name: 'Task 2',
    priority: 2
  }
]

It doesn’t return the task with the priority: 1.

This operator works for string values as well, but it is not recommended. Below is a query example of how we use the ＄gt operator on the string field.

db.tasks.find({
    name: {
        $gt: 'Task 1',
    },
});

This query returns the below output.

[
  {
    _id: ObjectId("60f98f8dac3c9ea06c0506aa"),
    name: 'Task 2',
    priority: 2
  }
]

... ...