Postgres DB Size Command

Question

What is the command to find the size of all the databases?

I am able to find the size of a specific database by using following command:

Answer 1

Yes, there is a command to find the size of a database in Postgres. It's the following:

SELECT pg_database.datname as "database_name", pg_size_pretty(pg_database_size(pg_database.datname)) AS size_in_mb FROM pg_database ORDER by size_in_mb DESC;