https://andyfoster.net/tags/databases/Recent content in Databases on Andy FosterHugoen-GBSun, 21 Jan 2024 15:25:50 +1200https://andyfoster.net/postgres-commands-basic/Sun, 21 Jan 2024 15:25:50 +1200https://andyfoster.net/postgres-commands-basic/<p>PostgreSQL commands can be broadly divided into command-line tools and SQL commands or functions you&rsquo;d use within the <code>psql</code> interface. I&rsquo;ll provide an overview of both:</p> <h2 id="command-line-tools">Command-Line Tools <a class="heading-anchor" href="#command-line-tools" aria-label="Link to this section">#</a></h2> <ol> <li> <p><strong><code>psql</code></strong>: The PostgreSQL command-line client.</p> <ul> <li>Connect to a database: <code>psql -h [hostname] -U [username] -d [database_name]</code></li> <li>List all databases: <code>psql -l</code></li> </ul> </li> <li> <p><strong><code>createdb</code></strong>: Create a new PostgreSQL database.</p> <ul> <li>Create a database: <code>createdb [database_name]</code></li> </ul> </li> <li> <p><strong><code>dropdb</code></strong>: Remove a PostgreSQL database.</p> <ul> <li>Drop a database: <code>dropdb [database_name]</code></li> </ul> </li> <li> <p><strong><code>createuser</code></strong>: Create a new PostgreSQL role/user.</p> <ul> <li>Create a new user: <code>createuser [username]</code></li> </ul> </li> <li> <p><strong><code>dropuser</code></strong>: Remove a PostgreSQL role/user.</p> <ul> <li>Drop a user: <code>dropuser [username]</code></li> </ul> </li> <li> <p><strong><code>pg_dump</code></strong>: Create a backup of a PostgreSQL database.</p> <ul> <li>Create a backup: <code>pg_dump [database_name] &gt; backup.sql</code></li> </ul> </li> <li> <p><strong><code>pg_restore</code></strong>: Restore a PostgreSQL database from a custom-format backup.</p> <ul> <li>Create a custom-format backup: <code>pg_dump -Fc [database_name] &gt; backup.dump</code></li> <li>Restore it: <code>pg_restore -d [database_name] backup.dump</code></li> <li>A plain <code>.sql</code> dump is restored with <code>psql -d [database_name] -f backup.sql</code> instead.</li> </ul> </li> </ol>