#案例：返回location_id是1400或1700的部門中的所有員工

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SELECT  last_name
FROM employees 
WHERE department_id IN(

    SELECT DISTINCT department_id
    FROM departments
    WHERE location_id IN (1400,1700)
);

#案例：返回其他工種中比job_id為'IT_PROG'部門任一工資低的員工的員工號、姓名、job_id和salary

SELECT DISTINCT employee_id,last_name,job_id,salary
FROM employees
WHERE salary'IT_PROG' ;

或者

SELECT DISTINCT employee_id,last_name,job_id,salary
FROM employees
WHERE salary<(
    SELECT DISTINCT MAX(salary)
    FROM employees
    WHERE job_id='IT_PROG'
) AND job_id <>'IT_PROG' ;

#案例：返回其他工種中比job_id為'IT_PROG'部門所有工資低的員工的員工號、姓名、job_id和salary

SELECT DISTINCT employee_id,last_name,job_id,salary
FROM employees
WHERE salary'IT_PROG' ;

或者

SELECT DISTINCT employee_id,last_name,job_id,salary
FROM employees
WHERE salary<(
    SELECT DISTINCT MIN(salary)
    FROM employees
    WHERE job_id='IT_PROG'
) AND job_id <>'IT_PROG' ;