Posgres: To list all existing users

 SELECT usename FROM pg_user;



cfdvlp=> SELECT usename FROM pg_user;

       usename

----------------------

 cloudsqladmin

 cloudsqlsuperuser

 cloudsqlagent

 cloudsqlimportexport

 cloudsqlreplica

 pgcfadmin

 postgres

 ordadmin

(8 rows)

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