swap-salary

java

python

python3

mysql

mssql

oraclesql

csharp

javascript

typescript

bash

swift

kotlin

dart

golang

ruby

scala

rust

racket

erlang

elixir

pythondata

postgresql

cangjie

Database

Table: <code>Salary</code>

<pre>
+-------------+----------+
| Column Name | Type |
+-------------+----------+
| id | int |
| name | varchar |
| sex | ENUM |
| salary | int |
+-------------+----------+
id is the primary key (column with unique values) for this table.
The sex column is ENUM (category) value of type (&#39;m&#39;, &#39;f&#39;).
The table contains information about an employee.
</pre>

&nbsp;

Write a solution to swap all <code>&#39;f&#39;</code> and <code>&#39;m&#39;</code> values (i.e., change all <code>&#39;f&#39;</code> values to <code>&#39;m&#39;</code> and vice versa) with a single update statement and no intermediate temporary tables.

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

The result format is in the following example.

&nbsp;
Example 1:

<pre>
Input: 
Salary table:
+----+------+-----+--------+
| id | name | sex | salary |
+----+------+-----+--------+
| 1 | A | m | 2500 |
| 2 | B | f | 1500 |
| 3 | C | m | 5500 |
| 4 | D | f | 500 |
+----+------+-----+--------+
Output: 
+----+------+-----+--------+
| id | name | sex | salary |
+----+------+-----+--------+
| 1 | A | f | 2500 |
| 2 | B | m | 1500 |
| 3 | C | f | 5500 |
| 4 | D | m | 500 |
+----+------+-----+--------+
Explanation: 
(1, A) and (3, C) were changed from &#39;m&#39; to &#39;f&#39;.
(2, B) and (4, D) were changed from &#39;f&#39; to &#39;m&#39;.
</pre>

swap_salary

Swap Salary

<div class="original__bRMd">
<div>
<code>Salary</code> 表：

<pre>
+-------------+----------+
| Column Name | Type |
+-------------+----------+
| id | int |
| name | varchar |
| sex | ENUM |
| salary | int |
+-------------+----------+
id 是这个表的主键（具有唯一值的列）。
sex 这一列的值是 ENUM 类型，只能从 ('m', 'f') 中取。
本表包含公司雇员的信息。
</pre>

&nbsp;

请你编写一个解决方案来交换所有的 <code>'f'</code> 和 <code>'m'</code> （即，将所有 <code>'f'</code> 变为 <code>'m'</code> ，反之亦然），仅使用 单个 update 语句 ，且不产生中间临时表。

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

结果如下例所示。

&nbsp;

示例 1:

<pre>
输入：
Salary 表：
+----+------+-----+--------+
| id | name | sex | salary |
+----+------+-----+--------+
| 1 | A | m | 2500 |
| 2 | B | f | 1500 |
| 3 | C | m | 5500 |
| 4 | D | f | 500 |
+----+------+-----+--------+
输出：
+----+------+-----+--------+
| id | name | sex | salary |
+----+------+-----+--------+
| 1 | A | f | 2500 |
| 2 | B | m | 1500 |
| 3 | C | f | 5500 |
| 4 | D | m | 500 |
+----+------+-----+--------+
解释：
(1, A) 和 (3, C) 从 'm' 变为 'f' 。
(2, B) 和 (4, D) 从 'f' 变为 'm' 。</pre>
</div>
</div>