ClickHouse JOIN: Why are Inner Joins Expensive?

Inner joins in ClickHouse involve combining rows from two or more tables based on a common key. While this operation is essential for analyzing data from multiple sources, it can be resource-intensive due to several reasons […]

ClickHouse JOIN: Mastering Chained Joins

Introduction Financial systems analytics demand sophisticated data manipulation, often involving multiple joins to extract valuable insights. In this guide, we will explore how to implement multiple joins, often referred to as chained joins, in ClickHouse, […]

ClickHouse JOIN: Mastering Hash Joins

Introduction In ClickHouse, Hash Joins are a powerful method for combining data from multiple tables efficiently. They fall under the category of “merge joins,” where ClickHouse takes advantage of sorted data structures to speed up the joining […]