Learning SQL

Databricks SQL INSERT REPLACE Explained—REPLACE USING and REPLACE ON for Delta Tables

A cleaner way to refresh partitions and fix keys without writing long MERGE statements

Stop Using INNER JOIN When You Only Need A Filter

How SEMI JOIN keeps Spark queries simpler, lighter and cheaper to run

Automate Reports Using SQL Procedures & Triggers

Guide to creating stored procedures and triggers to automate data workflows and generate scheduled reports

The Silent SQL Bug : When An Invalid Column Name Doesn’t Throw an error

TL;DR: SQL Server may silently convert an invalid column in a subquery into a correlated reference, meaning your query runs without errors…

Calculating Year-over-Year (YoY) Growth in SQL | Interview Preparation

Walmart SQL Interview Question with Step-by-Step Solution | Real Interview Experience

SQL interviews aren’t just about syntax — they’re about thinking in steps.”

Counting Non‑Null Columns Per Row the Smart Way in Snowflake

In complex datasets, columns often contain missing or incomplete values. Identifying how many fields within each record actually contain…

Flyway vs Liquibase: A Developer’s Guide to PostgreSQL Database Migrations (Without Breaking Your…

The Quick Pitch

ACID in Databases: The Backbone of Reliable Transactions

Understanding the four pillars that keep your data accurate, safe, and predictable

Calculating Running Total Sum in SQL Using Window Functions — Practice SQL Question

“Without data, you’re just another person with an opinion.” — W. Edwards Deming