# ClickHouse Cloud: Fast, Updatable Lookups with the Join Table Engine

DevFeed: [ClickHouse Cloud: Fast, Updatable Lookups with the Join Table Engine](<https://devfeed.tech/articles/clickhouse-cloud-fast-updatable-lookups-with-the-join-table-engine-5356.md>)

Original publisher: [Read original article](<https://clickhouse.com/blog/join-table-engine>)

Author: Hellmar Becker

Published: 2026-05-12T15:55:17Z

Content type: tutorial

Language: en

Sources: [ClickHouse Blog](<https://devfeed.tech/sources/clickhouse-blog.md>)

Topics: [data](<https://devfeed.tech/topics/data.md>)

Tags: [clickhouse](<https://devfeed.tech/tags/clickhouse.md>), [cloud](<https://devfeed.tech/tags/cloud.md>), [data](<https://devfeed.tech/tags/data.md>), [database](<https://devfeed.tech/tags/database.md>), [memory](<https://devfeed.tech/tags/memory.md>), [performance](<https://devfeed.tech/tags/performance.md>), [persistence](<https://devfeed.tech/tags/persistence.md>), [update](<https://devfeed.tech/tags/update.md>)

## AI overview

Explains how ClickHouse's Join table engine supports fast, updatable in-memory dimension lookups for analytical joins.

## Source excerpt

Learn how ClickHouse Cloud's Join table engine enables fast, updatable in-memory lookups for dimensional modeling -- with automatic upserts, deduplication, and data compaction powered by ReplacingMergeTree under the hood.