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create table departments( department_id serial primary key, department_name varchar(100) not null ); create table employees( id serial primary key, name varchar(100) not null, department_id int, constraint fk_department foreign key (department_id) references departments (department_id) ); insert into departments (department_name) values ('sales'), ('marketing'); insert into employees (name, department_id) values ('Jane', 1), ('Bob', 2), ('Maria', null); --select employees.name, departments.department_name from employees --left join departments on departments.department_id = employees.id; select employees.name from employees where employees.department_id in ( select department_id from departments )

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