Overview

Recently, I practiced MongoDB queries using a sample Job Portal database.

Instead of learning operators in isolation, I used a realistic Job Portal dataset to better understand how MongoDB queries work in real-world applications.

Dataset Structure

A sample jobs collection was created with fields such as:

title

company

location

salary

experience

skills

applicants

status

department

Example Document

{ title : " \" Software Engineer \" , " company : " TechCorp Bangladesh " , salary : 75000 , skills : [ " JavaScript " , " Node.js " , " MongoDB " ] }

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Topics Covered

1. Comparison Operators

Used for filtering documents based on value comparison.

Operators covered:

$eq

$ne

$gt

$gte

$lt

$lte

Example:

db . jobs . find ({ salary : { $gt : 70000 } })

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2. Logical Operators

Combining multiple query conditions.

Operators covered:

$and

$or

$not

$nor

Example:

db . jobs .…