https://leetcode.com/problems/second-highest-salary/


Runtime: 233 ms, faster than 36.39% of MySQL online submissions for Second Highest Salary.

Memory Usage: 0B, less than 100.00% of MySQL online submissions for Second Highest Salary.


```mysql
#9:30
(
SELECT DISTINCT salary AS SecondHighestSalary FROM Employee
ORDER BY salary DESC
LIMIT 1 OFFSET 1
)
UNION
(
SELECT null
)
ORDER BY SecondHighestSalary DESC
LIMIT 1
#9:33
#debug until 9:54
```