Cú pháp chạy: psql -U postgres -f [tên_file]. Chạy file 3.sql ở citus_woker_1, 3_test.sql ở citus_master

## 3.sql
DROP TABLE IF EXISTS series;

CREATE TABLE series (id int, description text);

SELECT create_reference_table('series');

## 3_test.sql
\d
	DROP TABLE IF EXISTS series;

	CREATE TABLE series (id int, description text);

	SELECT create_reference_table('series');