#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<ANY(
SELECT DISTINCT salary
FROM employees
WHERE job_id='IT_PROG'
) AND job_id <>'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<ALL(
SELECT DISTINCT salary
FROM employees
WHERE job_id='IT_PROG'
) AND job_id <>'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' ;
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