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How we built fast UPDATEs for the ClickHouse column store – Part 2: SQL-style UPDATEs

ClickHouse can do fast, declarative UPDATEs. Patch parts make it possible, with minimal I/O, instant query visibility, and high parallelism. This post breaks down the mechanics that make it all work.
Tom Schreiber
Jul 24, 2025
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