多行子查詢

• 返回多行
• 使用多行操作比較操作符

操作符含義

IN/NOT IN	等于列表中?任意一個
ANY/SOME	和子查詢返回的?某一個值?比較
ALL+	和子查詢返回的?所有值?比較

#案例1：返回location_id是1400或1700的部門中的所有員工姓名

#①查詢location_id是1400或1700的部門編號

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

#②查詢員工姓名，要求部門號是①列表中的某一個

SELECT last_name FROM employees WHERE?department_id?in(SELECT DISTINCT department_idFROM departmentsWHERE?location_id?IN(1400,1700) );

#或???????

SELECT last_name FROM employees WHERE?department_id?= ANY(SELECT DISTINCT department_idFROM departmentsWHERE location_id IN(1400,1700) );

注意：not in 等價于 <> ALL???????

SELECT last_name FROM employees WHERE?department_id?not in(SELECT DISTINCT department_idFROM departmentsWHERE location_id IN(1400,1700) );

等價于???????

SELECT last_name FROM employees WHERE?department_i?<> ALL(SELECT DISTINCT department_idFROM departmentsWHERE location_id IN(1400,1700) );

#案例2：返回其它工種中比job_id為‘IT_PROG’工種任一工資低的員工的員工號、姓名、job_id 以及salary

#①查詢job_id為‘IT_PROG’部門任一工資???????

SELECT DISTINCT salary FROM employees WHERE job_id = 'IT_PROG'

#②查詢員工號、姓名、job_id 以及salary，salary<(①)的任意一個???????

SELECT last_name,employee_id,job_id,salary FROM employees WHERE salary<ANY(SELECT DISTINCT salaryFROM employeesWHERE?job_id?=?'IT_PROG' ) AND job_id<>'IT_PROG';

#或???????

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

#案例3：返回其它部門中比job_id為‘IT_PROG’部門所有工資都低的員工? ?的員工號、姓名、job_id 以及salary???????

SELECT last_name,employee_id,job_id,salary FROM employees WHERE salary<ALL(SELECT DISTINCT salaryFROM employeesWHERE?job_id?=?'IT_PROG' ) AND job_id<>'IT_PROG';

#或???????

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

總結

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