Recent posts tagged sql

Stop writing SQL strings that look like a ransom note. Here's how to write queries that are readable, safe, and maintainable. The Problem With "Good Enough" SQL Formatting Most Python developers start here: userid = 5 query = "SELECT FROM users ...

Advanced SQL analytics for running a hospital database. Introduction Structured Query Language is essential and common in most industry sectors. In healthcare reporting, SQL plays a critical role in analytics. PostgreSQL lets data scientists take ...

!Abstract brand-toned data pathway backdrop for the billion-row SQL decision framework.https://unrivaled-starlight-d655be.netlify.app/blog/visuals/billion-row-sql-hero.png?v=2 A query that returns in 40 milliseconds on ten million rows can time out...

Think of a restaurant. Your Django code is the waiter, PostgreSQL is the kitchen, and the disk is the pantry. When dinner is slow, people blame the waiter's handwriting the ORM. Far more often the waiter is making 200 separate trips to the kitchen, o...

From Raw Logs to Business Strategy: How I Taught Myself Data Engineering & Analytics I didn’t take the traditional path into data. Over the past 12 months, I bypassed the university lecture halls to teach myself relational database architecture, pi...

What is Database Indexing? Database indexing is a technique used by software systems to speed up the retrieval of data from a database table. By creating a separate, organized pointer structure, the database can locate specific records without havi...

Most of us here have either built a text-to-SQL layer or been asked to. The demos always look great and the production version is the one that quietly returns the wrong number, so here is what actually separates the two. The Schema Is The Feature, N...

Four-Leaf's SQL Interview Guide1 Key takeaways A SQL interview is a translation test. The syntax is the easy half, and most candidates who fail were fluent in SQL. What sinks them is starting to type before the question is pinned down, or writing a...

https://youtu.be/GknBmsqaFk4 The bug Here's a login endpoint from a small Express demo app scan-target-demo-apps/apps/01-sql-injectionhttps://github.com/sendwavehub/scan-target-demo-apps: app.post'/login', req, res => { const { username = '', pa...

I added DuckDB to my SQL playground, and it turned out to be a sandboxing problem Sharing a small build-in-public update: sqlize.onlinehttps://sqlize.online, a free tool for testing SQL queries, checking JOINs, and sharing reproducible examples, ju...

Building More Than Just Projects — Building My Professional Identity Completing my Data Analyst Internship1 at Logic Stack was a significant milestone. Over four weeks, I worked on real-world business problems using Excel, Power BI, Python and SQL,...

In my previous blog, I shared my journey through Week 1 and Week 2, where I worked on Excel-based data cleaning, sales analysis, Pivot Tables and Power BI dashboards. As the internship progressed, the learning curve became much steeper. The focus sh...

Introduction Every learning journey begins with a single decision. For me, that decision was to step into the world of Data Analytics—a field that combines problem-solving, business understanding, and technology to transform raw data into meaningf...

In Python development, keeping your database queries clean often leads us to use aiosql, which lets us write pure SQL in .sql files and load them directly as callable Python methods. However, when building APIs or debugging, you often need to inspect...

You know the feeling. Someone shares a query in Slack, or you open a .sql file left behind by a developer who's long gone, and it's just... one giant wall of text. Lowercase here, uppercase there, no line breaks, five joins crammed into a single sent...

Flat JSON is easy. Nested JSON is where the day goes: an API response with orders inside customers inside accounts, a jsonb column three levels deep, a config file that grew a tree. Three tasks come up over and over, and each one has a trick that mak...

title: Chai aur SQL — A Beginner's Journey into Databases published: true canonicalurl: https://blog.abdulrdeveloper.me/chai-aur-sql-a-beginner-s-journey-into-databases tags: sql, postgresql, database, backend SQL stands for Structured Query Langu...

If you've taught SQL or learned it from a course, you've almost certainly met Sakila. The little DVD rental database has been the go-to sample schema for MySQL and MariaDB tutorials for nearly two decades. It's clean, well-normalized, and comes pre-...

Most SQL developers hear the same rule early: always prefer INNER JOIN over correlated subqueries, because subqueries create an N+1 performance problem. That rule is useful, but it is not always true. I tested this on four engines MySQL, Oracle, P...