A Practical Guide to SQL Joins, Subqueries, CTEs, and Window Functions.
A hospital database rarely stores every useful detail in one table. Patient details may be stored separately from visit records. Doctor, department,…
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Cronbach's Alpha Explained: Formula, Worked Example, Python/R Code, and a Free Calculator
You built a survey with several questions that are supposed to measure the same thing (say, "job satisfaction" or "stats anxiety"). Before you avera…
crates.io download count: 80% of ours arrived with a new version
Originally published at tensorust.com . TL;DR: On October 17, 2026 I pulled every daily download number crates.io has for my 69 Rust crates. Over 89…
How to Compare More Than 5 Keywords in Google Trends on One 0-100 Scale
If you've ever tried to chart 12 keywords from Google Trends, you've hit the wall: the compare box takes 5 terms max . The obvious workaround (run t…
How to Catch and Auto-Fix Broken CSVs Before Database Ingestion (RFC-4180)
The Silent Nightmare of Dirty CSV Files Every data engineer, analyst, and backend developer has experienced this: your automated ETL pipeline crashe…
From Raw Hourly Data to a Validated Model: A Pandas and scikit-learn Walkthrough
Hourly time-series data rarely arrives clean. Hours go missing, timestamps repeat, sensors report impossible values, and some series start years aft…
Measuring a Cardano perpetuals venue: volume, cross-venue price gaps, funding and maker markout on Strike Finance
Most of what we publish at The Cardano Record comes from our own cardano-db-sync node. This segment doesn't. Strike Finance is Cardano's perpetuals…
Do Cardano's governance vote rationales still resolve? Measuring it with db-sync and a blake2b-256 check
Under CIP-1694, a Cardano governance vote can carry an anchor : a URL to a document that explains the vote, plus a blake2b-256 hash of that document…
Kafka and Flink Hit a Wall at the Model Serving Boundary
TL;DR — Kafka/Flink pipelines are built around record-at-a-time, backpressure-aware processing, while model servers get their throughput from batchi…
Mastering Stress: Real-time HRV Outlier Detection with Bi-LSTM and TensorFlow 🧠💓
Have you ever wondered why your Apple Watch suddenly pings you to "take a breath" exactly when your boss sends that "Can we hop on a quick call?" Sl…
Closing the Loop in Healthcare AI: From Prediction to Verified Action
Healthcare AI evaluation often focuses on model outputs, including discrimination, calibration and predictive performance. These measures are import…
Sell the Line, Not the Dots: What Strangers Actually Pay Solo Data Builders For
A dataset is not a product. A decision you can make every morning without opening a laptop is a product. That distinction is the difference between…
What You Can Actually See in a Public Telegram Channel Without an Account
Searches for "see telegram channel without account" return a wall of shrugs. Here is the precise inventory of what the public web preview exposes, a…
Telegram Channels Are Order Books: Volume Spikes Precede Price Moves
A Telegram channel is not a media feed. It is a market. The proof: the posts have prices in them, and the price lines have shape. I run a small unat…
Secret Scanning Production Notes: Triage, Liveness, and Reports That Get Paid
Secret-scanning a target's public footprint sounds simple: grep public code for key patterns, alert on new hits. The first production week will teac…
Your Telegram Preview Crawl Is a Population, Not a Census: Post-ID Cursors and Coverage Ceilings
Every guide to scraping t.me/s/<channel> says the same thing: you can get the latest ~20 posts per fetch, no login. Nobody warns you about wha…
Git Push as OSINT Infrastructure: Zero-Server Telegram Collection on GitHub Actions
Short version: the cheapest OSINT infra that actually survives an incident is git push + cron . Long version, with the numbers. I run Telegram chann…
Get Google Trends data in Python without pytrends 429 errors
Disclosure: I built the Google Trends Actor used in this post and I earn money when people run it. I've tried to keep this useful even if you never…
Your AI Code Can Be Elegant Too
As the Machine Learning Engineering Manager at an AI-powered SaaS company, I get a front-row seat to the machine learning (ML) code written by data…
The Problem With AI Football Predictions Isn't the AI
By XG Mind AI (xgmind.com) A match preview lands in your feed with a confident 2–1 call, a fluent explanation of why the away captain's absence brea…
# Subqueries & CTEs: Two Ways to Query Inside a Query
Sometimes one query needs the result of another query to work. SQL gives you two main tools for that: subqueries and CTEs (Common Table Expressions)…
Top 20 Data Science Project Ideas for Your Portfolio 2026
Recruiters evaluating data science candidates increasingly look past certifications and coursework alone, focusing instead on a genuine portfolio of…
NumPy vs Pandas: Which Python Library Is Better?
“Which is better, NumPy or Pandas?” is one of the most common questions beginners ask when they start Python for data work, and it’s the wrong quest…
Building an Enterprise Climate Intelligence OS
How We Won 1st Place at CodeFest Datathon 2026: Building an Enterprise Carbon Intelligence OS Winning 1st place at the SLIIT CodeFest Datathon 2026…
Data Modelling, Relationships and Joints in Power BI
Introduction A Power BI report is only as reliable as the model beneath it. Data modelling is the process of organising tables, keys, relationships,…
Root Cause Analysis Charts: How to Find Why a Metric Dropped
Root cause analysis leans on a different set of charts than reporting does. Seven do most of the work, and each one answers a single diagnostic ques…
Airbnb has no public API - how to get listing and price data for any city (Python)
People search "Airbnb API" thousands of times a month, but Airbnb has never had a public API for listing data. Its partner APIs are for hosts and so…
I built a self-hostable AI data analyst — 4 agents, sandboxed code execution, your choice of LLM
Every time I needed to explore a dataset quickly, the same wall appeared: spin up a notebook, deal with encoding errors, write the cleaning boilerpl…
Five results: I spent time proving splines don't help trajectory databases
If you work with GPS tracks, this idea shows up sooner or later: why store a trajectory as a polyline of thousands of points when a vehicle moves sm…
Introduction to Machine Learning
WHAT IS MACHINE LEARNING? Machine learning (ML) is a branch of artificial intelligence that enables computers to learn from data and make prediction…