Primary Key

ApsaraDB for ClickHouse Part1 - Introduction to ClickHouse

In this part of the ClickHouse video tutorial, we will introduce the background and features of the ClickHouse, as well as the features of Column-oriented database and some use cases.

PostgreSQL Deferrable Constraints: Unique, Primary Key, Foreign Key, and Exclude

In this article, the author explains various deferrable constraints in PostgreSQL, including unique, primary key, foreign key, and exclude.