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All LessonsFree Lessons (3)

Getting Started

Introduction Comprehensive MongoDB Database: E-Commerce Platform

CRUD Operations

Practice Theoretical Questions Write Query: Insert a Record Solution: Insert a Record Similar Interview Questions: Insert a Record Write Query: Find a Record Solution: Find a Record Similar Interview Questions: Find a Record Write Query: Update a Record Solution: Update a Record Similar Interview Questions: Update a Record Write Query: Delete a Record Solution: Delete a Record Similar Interview Question: Delete a Record

Querying and Projection

Practice Theoretical Questions Write Query: Using Comparison Operators Solution: Using Comparison Operators Similar Interview Questions: Using Comparison Operators Write Query: Using Logical Operators Solution: Using Logical Operators Similar Interview Questions: Using Logical Operators Write Query: Using Regular Expressions Solution: Using Regular Expressions Similar Interview Questions: Using Regular Expressions

Array and Nested Queries

Practice Theoretical Questions

Write Query: Reading Arrays

Solution: Reading Arrays

Similar Interview Questions: Reading Arrays

Write Query: Updating Arrays

Solution: Updating Arrays

Similar Interview Questions: Updating Arrays

Write Query: Nested Queries and Fields

Solution: Nested Queries and Fields

Similar Interview Questions: Nested Queries and Fields

Aggregation Framework

Practice Theoretical Questions Write Query: Multi-Stages Aggregation Solution: Multi-Stages Aggregation Similar Interview Questions: Multi-Stages Aggregation Write Query: Grouping Across Collections Solution: Grouping Across Collections Similar Interview Questions: Grouping Across Collections Write Query: Merging Documents Solution: Merging Documents Similar Interview Questions: Merging Documents

Indexing and Performance

Practice Theoretical Questions Write Query: Create a Compound Index Solution: Create a Compound Index Similar Interview Questions: Create a Compound Index

Wrap Up

MongoDB Interview Preparation

Solution: Reading Arrays

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Concepts

Query

db.products.find(
  {
    tags: { $elemMatch: { $regex: /\busb\b/i } }
  },
  {
    name: 1,
    category: 1,
    tags: 1,
    _id: 0
  }
)

The explanation of the query is given below:

Line 1: This begins a query on the products collection using the find() method. This tells MongoDB that we want to retrieve documents from the products collection that match ...