数据库SQL实战 No.17
获取当前薪水第二多的员工的emp_no以及其对应的薪水salary
http://www.nowcoder.com/questionTerminal/8d2c290cc4e24403b98ca82ce45d04db
SELECT emp_no, salary
FROM salaries
WHERE salary = (SELECT salary
FROM salaries
WHERE to_date = '9999-01-01'
GROUP BY salary
ORDER BY salary DESC LIMIT 1,1 )
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