行子查詢(結果集一行多列或多行多列)
案例：查詢員工編號最小並且工資最高的員工資訊
select *
from employees
where (employee_id,salary)=(
select min(employee_id),max(salary)
from employees
);1.查詢員工編號最小
select
min(employee_id)
from employees;
select
max(salary)
from employees;
select
*from employees
where employee_id =
(select
min(employee_id)
from employees;
)and salary =
(select
max(salary)
from employees;
);
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