Coding Tutorials by Alex Merced

Dimensional modeling works well when your source systems are stable and your business questions are predictable. But what happens when sources change constan...

Normalization is the first rule taught in database design. Eliminate redundancy. Store each fact once. Use foreign keys. It's the right rule for transactiona...

Both terms appear in every modern data architecture diagram. They're used interchangeably in conference talks, Slack threads, and vendor marketing. And almos...

Your team builds an AI agent. It connects to your data warehouse. A product manager types What was revenue last quarter? and gets a number. The number is wrong.

Ask three teams in your company how they calculate revenue and you'll get three answers. Sales counts bookings. Finance counts recognized revenue. Marketing...

Most teams start building a semantic layer the wrong way: they open their BI tool, create a few calculated fields, and call it done. Six months later, three ...