mongodb query document using find method

To query documents in a MongoDB collection, you can use the find() method. Here are the steps to query documents using the find() method:

1. Open the MongoDB shell: Open a terminal or command prompt and run the mongo command to open the MongoDB shell.

2. Switch to the database containing the collection you want to query: Use the use command followed by the name of the database to switch to the database containing the collection. For example, to switch to a database named "mydb", run the following command:

use mydb

3. Use the find() method to query documents: Run the find() method on the collection you want to query. For example, to find all documents in a collection named "mycollection", run the following command:

db.mycollection.find()

This will return all documents in the collection. You can also pass in a query object as an argument to filter the results. For example, to find all documents in a collection named "mycollection" where the "age" field is greater than or equal to 30, run the following command:

db.mycollection.find({age: {$gte: 30}})

4. Use various options to modify the query: You can use various options to modify the query, such as specifying which fields to include or exclude, sorting the results, limiting the number of results, and skipping a certain number of results. For example, to find all documents in a collection named "mycollection" where the "age" field is greater than or equal to 30, include only the "name" field, sort the results by the "age" field in descending order, limit the results to 10, and skip the first 5 results, run the following command:

db.mycollection.find({age: {$gte: 30}}, {name: 1, _id: 0}).sort({age: -1}).limit(10).skip(5)