MongoDB Query API

MongoDB Query API

The MongoDB Query API is the set of methods and operators used to create, read, update, and delete (CRUD) data in MongoDB.

It is powerful, flexible, and easy to use compared to traditional SQL queries.

Basic Query Structure

query → filter condition
projection → fields to include or exclude

Read Operations (Find)

Find all documents

Find with condition

Find one document

Projection (Select Specific Fields)

Include fields:

Exclude field:

Comparison Query Operators

Operator	Meaning
`$eq`	equal
`$ne`	not equal
`$gt`	greater than
`$gte`	greater than or equal
`$lt`	less than
`$lte`	less than or equal
`$in`	in array
`$nin`	not in array

Example:

Logical Query Operators

$and

$or

$not

Element Query Operators

$exists

$type

Array Query Operators

$all

$size

Update Operations

Update one

Update many

Increment value

Delete Operations

Delete one

Delete many

Sorting, Limiting & Skipping

Sort

Limit

Skip

Regular Expression (Search)

Count Documents

SQL vs MongoDB Query Example

SQL

MongoDB

Summary

MongoDB Query uses JSON-like syntax
Supports rich operators
Faster and flexible than SQL
Ideal for modern applications

MongoDB Query API