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How to write efficient queries
This module covers how to write efficient queries in ClickHouse: optimization techniques, tools for analyzing query performance, and strategies for JOINs and dictionaries.
What you'll learn
- Query Fundamentals: Understanding how ClickHouse executes queries and how sorting keys affect performance
- Optimization Tools: Using EXPLAIN to analyze queries and data skipping indices to reduce data scanned
- Query Techniques: Denormalization strategies and using PREWHERE for early filtering
- Advanced Optimization: Choosing the right JOIN algorithms and using dictionaries for efficient lookups