Table-to-table join
A table-to-table join combines two changing keyed tables and updates the resulting values when either table changes.
Kafka Streams in Action, Second Edition
A table-table join is a Kafka Streams operation that combines two KTable representations and recalculates results when either table changes.
- How it is used
- Maintains a derived table by combining current records from two changing KTables.
- How deep it goes
- Explains update triggers, partition constraints, foreign-key joins, and repartition-based processing without detailing API configuration.
- Examples
- Uses client contracts with commodity prices and activity counts joined to rewards members.
- What you can do after
- Apply it via Kafka Streams or ksqlDB to produce joined table results when either input table changes.
Read how Kafka Streams in Action, Second Edition explains table-to-table join →
Apache Kafka in Action
A table-table join combines two changing tables and updates results when either table changes.
- How it is used
- Enriches continuously changing master data by combining two keyed tables whose updates must remain reflected in the result.
- How deep it goes
- Explains key alignment, partitioning, triggering behavior, and inner-join selection, then demonstrates the Kafka Streams structure.
- Examples
- Uses loyalty cards joined with customers and contrasts them with price changes correlated with sales inside a one-minute window.
- What you can do after
- Build it with Kafka Streams by defining keyed tables, selecting a joiner, and applying a primary-key join.
Read how Apache Kafka in Action explains table-to-table join →
Related concepts
- joinkind of · A join is an operation that combines records or rows from multiple data sources according to specified matching conditions or relationships.
- stream-table joincontrasts with · A stream-table join combines each incoming stream record with the current table value associated with the record’s matching key.
- foreign key associationincludes · A foreign key association is a relationship or join between records whose key in one entity or table references a key in another.
- KTableuses · KTable is a Kafka Streams abstraction representing the latest value associated with each key as a continuously updated table.
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