MySQL/176. Second Highest Salary 第二高的薪水

題目       代碼部分一（1095ms） SELECT MAX(Salary) AS SecondHighestSalary FROM Employee E1 WHERE 1=(SELECT COUNT(DISTINCT(E2.Salary)) FROM Employee E2 WHERE E2.Salary>E1.Salary);   代碼部分二（222ms） SEL

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