Manoj Kumar - DEV Community

Manoj Kumar

Mar 29

Modifying Tables Safely in PostgreSQL — ALTER TABLE, Constraints, and Defaults

#database #postgres #sql #tutorial

4 min read

Manoj Kumar

Mar 29

PostgreSQL Table Design — Constraints, Defaults, and Foreign Keys Explained Simply

1 min read

Manoj Kumar

Mar 29

Handling Duplicate Transfers in PostgreSQL — Idempotency and How Real Payment Systems Stay Safe

4 min read

Manoj Kumar

Mar 29

Does Your Payment Data Survive a Crash? Testing Durability in PostgreSQL

4 min read

Manoj Kumar

Mar 29

Concurrent Transactions in PostgreSQL — Isolation Levels, Dirty

5 min read

Manoj Kumar

Mar 29

How PostgreSQL Keeps Your Wallet Data Honest — Constraints, Violations, and Consistency

4 min read

Manoj Kumar

Mar 29

Building a Safe Money Transfer System in PostgreSQL — Transactions, Rollbacks, and What Happens When Things Break

#backend #database #postgres #sql

3 min read

Manoj Kumar

Mar 29

Sakila SQL Practice — User Roles, Permissions, and Access Control in PostgreSQL

#database #postgres #security #sql

3 min read

Manoj Kumar

Mar 29

Sakila SQL Practice — Filtering, Pattern Matching, and Pagination Queries

4 min read

Manoj Kumar

Mar 29

the Sakila database

3 min read

Manoj Kumar

Mar 29

HackerRank SQL — Querying Every Row and Column from the CITY Table

1 min read

Manoj Kumar

Mar 29

HackerRank SQL — Finding the Difference Between Total and Distinct City Counts

1 min read

Manoj Kumar

Mar 29

HackerRank SQL — All Details of American Cities with Population Over 100000

#beginners #database #sql #tutorial

1 min read

Manoj Kumar

Mar 29

HackerRank SQL — Pulling City and State from the STATION Table

#beginners #database #sql #tutorial

1 min read

Manoj Kumar

Mar 29

HackerRank SQL — City Names That Do Not Start With Vowels

#beginners #database #sql #tutorial

1 min read

Manoj Kumar

Mar 29

HackerRank SQL — Getting American City Names with Population Over 120000

#beginners #database #sql #tutorial

1 min read

Manoj Kumar

Mar 29

HackerRank SQL — Fetching All Japanese Cities from the CITY Table

1 min read

Manoj Kumar

Mar 29

Solving HackerRank Basic Select — Query All Columns for a City by ID

1 min read

Manoj Kumar

Mar 23

Setup a DNS hosted zone in Route53 in AWS

2 min read

Manoj Kumar

Mar 23

simple EC2 instance and run a webserver and access it from outside

#aws #beginners #cloud #tutorial

2 min read

Manoj Kumar

Mar 23

how DNS resolver is happening

#beginners #networking #tutorial #webdev

2 min read

Manoj Kumar

Mar 23

How a request originates from cllient and reaches the server ?

#beginners #networking #tutorial #webdev

2 min read

Manoj Kumar

Mar 23

blog on IP address and Subnet

2 min read

Manoj Kumar

Mar 22

CA 15 - Merge Two Linked List

#algorithms #computerscience #interview #python

2 min read

Manoj Kumar

Mar 22

Merge Sort for Linked List – Python

#algorithms #computerscience #python #tutorial

2 min read

Manoj Kumar

Mar 22

Remove Duplicates from a Sorted Linked List – Python

#algorithms #beginners #computerscience #python

2 min read

Manoj Kumar

Mar 22

Reverse a Linked List – Python (Step-by-Step)

1 min read

Manoj Kumar

Mar 22

Majority Element – Python (Boyer-Moore Algorithm)

#algorithms #computerscience #python #tutorial

2 min read

Manoj Kumar

Mar 22

Search in Rotated Sorted Array – Python

#algorithms #computerscience #interview #python

2 min read

Manoj Kumar

Mar 22

First and Last Occurrence in Sorted Array – Python

#algorithms #beginners #python #tutorial

2 min read

Manoj Kumar

Mar 22

Squares of a Sorted Array – Python (Two Pointer Approach)

#algorithms #computerscience #interview #python

2 min read

Manoj Kumar

Mar 22

Different Sorting Methodologies in Python – Complete Guide

#algorithms #computerscience #python #tutorial

2 min read

Manoj Kumar

Mar 22

Guess Number Higher or Lower – Python (Binary Search)

#algorithms #beginners #python #tutorial

2 min read

Manoj Kumar

Mar 22

Valid Anagram – Python Solution

1 min read

Manoj Kumar

Mar 22

Move Zeroes – Python (In-Place Solution)

#algorithms #interview #python #tutorial

1 min read

Manoj Kumar

Mar 22

Next Permutation – Python (Step-by-Step Explanation)

2 min read

Manoj Kumar

Mar 22

Kadane’s Algorithm – Maximum Subarray Sum (Python)p2

#algorithms #computerscience #python #tutorial

2 min read

Manoj Kumar

Mar 22

Kadane’s Algorithm – Maximum Subarray Sum (Python)

#algorithms #computerscience #python #tutorial

2 min read

Manoj Kumar

Mar 22

Move All Negative Elements to End – Python

#algorithms #beginners #coding #python

2 min read

Manoj Kumar

Mar 22

Sort 0s, 1s and 2s – Python (Dutch National Flag Algorithm)

#python #beginners

2 min read

Manoj Kumar

Mar 22

Kth Smallest Element in an Array – Python

#python #beginners

2 min read

Manoj Kumar

Mar 22

Find Minimum and Maximum in an Array – Python

#python #beginners

1 min read

Manoj Kumar

Mar 22

Reverse an Array – Python Solution

#python #beginners

1 min read

Manoj Kumar

Mar 22

Two Sum II – Input Array Is Sorted (Python)

#python #beginners #leetcode

2 min read

Manoj Kumar

Mar 22

Two Sum Problem – Python Solution

#python #beginners

2 min read

Manoj Kumar

Mar 22

CA 03 – Number Guessing Game Leaderboard (Python)

#python #beginners

2 min read

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