{ "data": { "question": { "questionId": "627", "questionFrontendId": "627", "categoryTitle": "Database", "boundTopicId": 1209, "title": "Swap Salary", "titleSlug": "swap-salary", "content": "

Table: Salary

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\n+-------------+----------+\n| Column Name | Type     |\n+-------------+----------+\n| id          | int      |\n| name        | varchar  |\n| sex         | ENUM     |\n| salary      | int      |\n+-------------+----------+\nid is the primary key (column with unique values) for this table.\nThe sex column is ENUM (category) value of type ('m', 'f').\nThe table contains information about an employee.\n
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Write a solution to swap all 'f' and 'm' values (i.e., change all 'f' values to 'm' and vice versa) with a single update statement and no intermediate temporary tables.

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Note that you must write a single update statement, do not write any select statement for this problem.

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The result format is in the following example.

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Example 1:

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\nInput: \nSalary table:\n+----+------+-----+--------+\n| id | name | sex | salary |\n+----+------+-----+--------+\n| 1  | A    | m   | 2500   |\n| 2  | B    | f   | 1500   |\n| 3  | C    | m   | 5500   |\n| 4  | D    | f   | 500    |\n+----+------+-----+--------+\nOutput: \n+----+------+-----+--------+\n| id | name | sex | salary |\n+----+------+-----+--------+\n| 1  | A    | f   | 2500   |\n| 2  | B    | m   | 1500   |\n| 3  | C    | f   | 5500   |\n| 4  | D    | m   | 500    |\n+----+------+-----+--------+\nExplanation: \n(1, A) and (3, C) were changed from 'm' to 'f'.\n(2, B) and (4, D) were changed from 'f' to 'm'.\n
\n", "translatedTitle": "变更性别", "translatedContent": "
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Salary 表：

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\n+-------------+----------+\n| Column Name | Type     |\n+-------------+----------+\n| id          | int      |\n| name        | varchar  |\n| sex         | ENUM     |\n| salary      | int      |\n+-------------+----------+\nid 是这个表的主键（具有唯一值的列）。\nsex 这一列的值是 ENUM 类型，只能从 ('m', 'f') 中取。\n本表包含公司雇员的信息。\n
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请你编写一个解决方案来交换所有的 'f' 和 'm' （即，将所有 'f' 变为 'm' ，反之亦然），仅使用 单个 update 语句 ，且不产生中间临时表。

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注意，你必须仅使用一条 update 语句，且 不能 使用 select 语句。

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结果如下例所示。

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示例 1:

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\n输入：\nSalary 表：\n+----+------+-----+--------+\n| id | name | sex | salary |\n+----+------+-----+--------+\n| 1  | A    | m   | 2500   |\n| 2  | B    | f   | 1500   |\n| 3  | C    | m   | 5500   |\n| 4  | D    | f   | 500    |\n+----+------+-----+--------+\n输出：\n+----+------+-----+--------+\n| id | name | sex | salary |\n+----+------+-----+--------+\n| 1  | A    | f   | 2500   |\n| 2  | B    | m   | 1500   |\n| 3  | C    | f   | 5500   |\n| 4  | D    | m   | 500    |\n+----+------+-----+--------+\n解释：\n(1, A) 和 (3, C) 从 'm' 变为 'f' 。\n(2, B) 和 (4, D) 从 'f' 变为 'm' 。
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