Leetcode-Database-176-Second Highest Salary-Easy（转）
leetcode地址：https://oj.leetcode.com/problems/second-highest-salary/ 这个问题很有趣，是要求我们写个sql来查询Employee表里第二高的工资，如果没有第二高的，那么返回null。 +----+--------+ | Id | Salary | +----+--------+ | 1 | 100 | | 2 | 2
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