InfluxDB 3 Core represents a significant rewrite aimed at enhancing speed and simplicity, addressing user demands for unlimited cardinality, SQL support, and a separation of compute and storage. The open-source version simplifies installation with a one-command setup and is designed to efficiently handle high cardinality data without compromising performance.

The article discusses the concept of temporal joins, which allow for querying time-based data across different tables in a database. It covers the importance of temporal data in applications and provides examples of how to implement temporal joins effectively. Additionally, it highlights the benefits of using these joins for better data analysis and insights.