题目2：MySQL----------Second Highest Salary

# Write your MySQL query statement below
SELECT max(Salary) FROM Employee WHERE Salary < (SELECT max(Salary) FROM Employee)

题目解析：

SELECT max(Salary) FROM Employee WHERE Salary < (SELECT max(Salary) FROM Employee)

Using max() will return a NULL if the value doesn‘t exist. So there is no need to UNION a NULL. Of course, if the second highest value is guaranteed to exist, using LIMIT 1,1 will be the best answer.

题目2：MySQL----------Second Highest Salary

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