CREATE TABLE employees (employee_id VARCHAR, department_id VARCHAR)
CREATE TABLE countries (country_name VARCHAR, country_id VARCHAR)
CREATE TABLE locations (location_id VARCHAR, country_id VARCHAR)
CREATE TABLE departments (department_id VARCHAR, location_id VARCHAR)

Find employee with ID and name of the country presently where (s)he is working.
SELECT T1.employee_id, T4.country_name FROM employees AS T1 JOIN departments AS T2 ON T1.department_id = T2.department_id JOIN locations AS T3 ON T2.location_id = T3.location_id JOIN countries AS T4 ON T3.country_id = T4.country_id
SELECT "T1"."employee_id", "T4"."country_name" FROM "employees" AS "T1" JOIN "departments" AS "T2" ON "T1"."department_id" = "T2"."department_id" JOIN "locations" AS "T3" ON "T2"."location_id" = "T3"."location_id" JOIN "countries" AS "T4" ON "T3"."country_id" = "T4"."country_id"