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Schema Definition

TL;DR

Five ways to define schemas: manual design, inference from data, smart analysis, AI-assisted design, and predefined templates.

Manual Design

Schema definition matters for performance in ClickHouse. You can manually define your schemas, or use tools to help.

CREATE TABLE analytics_events ( event_time DateTime CODEC(Delta, ZSTD), user_id UInt32, session_id String, event_type LowCardinality(String), properties String -- JSON string ) ENGINE = MergeTree()
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Schema Definition | ClickHouse for Developers