Faster than 96.64%
MYSQL\n\nselect employee_id from employees\n    where employee_id not in(\n        select e.employee_id from employees as e, salaries as s\n        where e.empl
# MYSQL\n```\nselect employee_id from employees\n    where employee_id not in(\n        select e.employee_id from employees as e, salaries as s\n        where e.employee_id = s.employee_id\n    )\nunion\nselect employee_id from salaries\n    where employee_id not in(\n        select e.employee_id from employees as e, salaries as s\n        where e.employee_id = s.employee_id\n    )\norder by employee_id\n```
['Union Find', 'MySQL']