In order for this book to be useful, you need at least access to a PostgreSQL client that is allowed to execute queries on a server. Ideally, you'll also be the server administrator. Full client and server packages for PostgreSQL are available for most popular operating systems at http://www.postgresql.org/download/. All the examples here are executed on Command Prompt, usually running the psql program. This makes them applicable to most platforms. It's straightforward to do many of these operations using a GUI tool for PostgreSQL instead, such as the pgAdmin program. Some scripts that are written in the bash scripting language are provided.
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