ClickHouse is an open-source column-oriented DBMS that supports all standard SQL JOIN types and provides additional specialized joins for analytical queries and time-series analysis. The supported join types include INNER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, FULL OUTER JOIN, CROSS JOIN, LEFT SEMI JOIN, RIGHT SEMI JOIN, INNER ANY JOIN, and ASOF JOIN. Each join type has its own behavior and use cases, and ClickHouse adapts classical join algorithms to its query pipeline for optimal execution. The blog post demonstrates the different join types using example queries and datasets, providing insights into how ClickHouse can be used to optimize analytical queries and time-series analytics.