SELECT * FROM stream: An Interactive Guide to Flink's Table-Stream Duality
TLDR I built an interactive tutorial that teaches Flink SQL’s table-stream duality with animated visualizations you can explore in your browser. Six sections guide you from "what is a dynamic table" to writing live aggregation queries, with code examples in both SQL and the Table API. It is open source, MIT licensed, and I’m accepting feature requests at the GitHub repo. The Concept That Trips Everyone Up Every time I teach Flink SQL, I hit the same wall. The concept of table-stream duality makes perfect sense to me after years of experience, but I can see the exact moment when someone new to Flink gets confused. You say "a table is just a materialized view of a stream" and their eyes glaze over. By the time you say "a stream is just a changelog of a table" you’ve lost them entirely. ...