{ "data": { "question": { "questionId": "176", "questionFrontendId": "176", "categoryTitle": "Database", "boundTopicId": 1177, "title": "Second Highest Salary", "titleSlug": "second-highest-salary", "content": "

Table: Employee

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\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| id          | int  |\n| salary      | int  |\n+-------------+------+\nid is the primary key (column with unique values) for this table.\nEach row of this table contains information about the salary of an employee.\n
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Write a solution to find the second highest salary from the Employee table. If there is no second highest salary, return null (return None in Pandas).

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The result format is in the following example.

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Example 1:

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\nInput: \nEmployee table:\n+----+--------+\n| id | salary |\n+----+--------+\n| 1  | 100    |\n| 2  | 200    |\n| 3  | 300    |\n+----+--------+\nOutput: \n+---------------------+\n| SecondHighestSalary |\n+---------------------+\n| 200                 |\n+---------------------+\n
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Example 2:

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\nInput: \nEmployee table:\n+----+--------+\n| id | salary |\n+----+--------+\n| 1  | 100    |\n+----+--------+\nOutput: \n+---------------------+\n| SecondHighestSalary |\n+---------------------+\n| null                |\n+---------------------+\n
\n", "translatedTitle": "第二高的薪水", "translatedContent": "Employee 表：\n
\n
\n
\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| id          | int  |\n| salary      | int  |\n+-------------+------+\n在 SQL 中，id 是这个表的主键。\n表的每一行包含员工的工资信息。\n
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查询并返回 Employee 表中第二高的薪水 。如果不存在第二高的薪水，查询应该返回 null(Pandas 则返回 None) 。

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查询结果如下例所示。

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示例 1：

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\n输入：\nEmployee 表：\n+----+--------+\n| id | salary |\n+----+--------+\n| 1  | 100    |\n| 2  | 200    |\n| 3  | 300    |\n+----+--------+\n输出：\n+---------------------+\n| SecondHighestSalary |\n+---------------------+\n| 200                 |\n+---------------------+\n
\n\n

示例 2：

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\n输入：\nEmployee 表：\n+----+--------+\n| id | salary |\n+----+--------+\n| 1  | 100    |\n+----+--------+\n输出：\n+---------------------+\n| SecondHighestSalary |\n+---------------------+\n| null                |\n+---------------------+\n
\n
\n
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