In the previous chapter, we looked at a tool that is used to design databases. Now, let's cover a few tools that are used with PostgreSQL to manipulate data, create, drop, and alter objects, find out what is happening on the server, and so on. In this chapter, we will cover one GUI and one command-line tool that are used to work with PostgreSQL. We will see how database connections are made, how SQL statements are executed, and how database objects and related metadata can be viewed. We will also look at a couple of advanced use cases (such as generating the plan for queries and changing configuration parameters).