题目:
思路一:
在小于最高salary的数据集中找最高salary
SELECT emp_no,MAX(salary)
FROM salaries
WHERE to_date = '9999-01-01' AND salary <(
SELECT MAX(salary)
FROM salaries);
思路二:
在除去最高salary的数据集中找最高salary
SELECT emp_no,MAX(salary)
FROM salaries
WHERE to_date = '9999-01-01' AND salary NOT IN(
SELECT MAX(salary)
FROM salaries);