DOCUMENT EXTRACTION
How to Photograph Receipts for Accurate OCR
Practical camera techniques to prevent OCR misrecognitions: lighting angle, shadow avoidance, flat surfaces, and Laplacian blur gates.
Engineering Reference
Technical Guides & Tutorials
In-depth, code-backed engineering tutorials covering document intelligence, pattern safety, and relational database querying.
TAX & ACCOUNTING
Tax Invoice & GSTIN Field Extraction Guide
Detailed checklist for B2B commercial invoices: state code validation, PAN structure, CGST/SGST/IGST breakdown, and arithmetic reconciliation.
SQL QUERYING
SQL Joins with Sample Schemas & Data
Interactive walkthrough of INNER, LEFT, and CROSS JOINs using an e-commerce customer and order schema executed in SQLite.
DATABASE DIALECTS
SQLite vs PostgreSQL Syntax Differences
Migration cheatsheet for moving generated queries from in-memory SQLite sandboxes to production PostgreSQL clusters.