If you are familiar with MySQL, the result of having a sequence in Postgres is comparable to the AUTO_INCREMENT behavior. In particular, Postgres uses a sequence to generate a progressive number, which usually represents an automatically incremented numeric primary key.
The official documentation explains that a sequence is nothing more than a number generator. Delving into the out-of-sync sequence problem in Postgres What is a Postgres sequence? We will learn about sequences, see what circumstances lead to the out-of-sync issue, learn how to diagnose the problem, and finally solve it. In this article, we'll teach you about the out-of-sync issue and show you how to solve it. Postgres even returns a confusing error message when this happens. Specifically, Postgres sequences are prone to go out of sync, preventing you from inserting new rows.
Yet, Postgres has some well-known issues, and one of the most annoying ones involves sequences. It's particularly appreciated by the developer community because it supports both SQL and JSON querying, making it is both relational and non-relational compliant. Postgres is one of the most advanced and widely used open-source RDBMS (Relational Database Management Systems) in the world.
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