Managing database users is a core task for any administrator. PostgreSQL offers two straightforward methods to list users: via the psql terminal and by querying the database. This guide walks you through both approaches.
Listing users in PostgreSQL
Use the psql command
The psql terminal lets you directly manage and query your database.
Connect to PostgreSQL
Use this command to log in.
psql -U <username>
Run the Command
Enter this command for a list of users.
\du
Or this for detailed output:
\du+
Query the database
For structured information, query the pg_user view.
Run the Query
SELECT *
FROM pg_catalog.pg_user;
Interpret the Results
This shows user details, including permissions and roles.
FAQ
How do I display superusers only?
Run this query
SELECT *
FROM pg_catalog.pg_user
WHERE usesuper = true;
Can I see logged-in users?
Yes, query pg_stat_activity
SELECT *
FROM pg_catalog.pg_stat_activity
WHERE state = 'active';
Why is authentication necessary?
It ensures security by restricting access to sensitive data and preventing unauthorized users from listing database users.
Which tools can simplify this process?
DbVisualizer offers a visual interface for managing queries and inspecting user details more easily.
Conclusion
PostgreSQL makes listing users simple with psql commands or SQL queries. Use these methods to maintain database security and organization. For more, visit the article Postgres List Users: Two Different Approaches.
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