Join (Streaming)

A Streaming Join combines data from two or more streams (or a stream and a table) based on common attributes or keys, producing a resulting stream of correlated events. Unlike batch joins on static datasets, streaming joins operate continuously on potentially unbounded, ever-changing inputs, requiring state management to store relevant data from each stream. RisingWave supports various streaming join types (e.g., stream-stream, stream-table) defined using SQL syntax.