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SQL Queries

An Introduction to Subqueries

This article shares the optimization techniques of subqueries and tips on handling subqueries in distributed databases.

ClickHouse Source Code Introduction – The Story of SQL Queries

This article introduces to ClickHouse source code and describes what happens to the kernel when executing SQL queries.

Query Optimization Technology for Correlated Subqueries

This article describes what correlated subqueries are and how to rewrite correlated subqueries as SQL queries in common semantics.