Check the current session process id, schema, user, and database in PostgreSQL

Find the current session process id, schema, user and database in PostgreSQL

select pg_backend_pid();

Check the current session schema in PostgreSQL

select current_schema();

Check the current session user in PostgreSQL:

select current_user;

check user id:
select current_user_id;

Check the current database in PostgreSQL:

select current_database();