55 lines
1.4 KiB
Markdown
55 lines
1.4 KiB
Markdown
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# Swap salary
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[Leetcode](https://leetcode.com/problems/swap-salary/)
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Table: `Salary`
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```
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+-------------+----------+
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| Column Name | Type |
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+-------------+----------+
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| id | int |
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| name | varchar |
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| sex | ENUM |
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| salary | int |
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+-------------+----------+
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```
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Id is the primary key for this table.
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The sex column is ENUM value of type ('m', 'f').
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The table contains information about an employee.
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Write an SQL query 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 query result format is in the following example.
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## Example 1:
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```
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Input:
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Salary table:
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+----+------+-----+--------+
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| id | name | sex | salary |
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+----+------+-----+--------+
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| 1 | A | m | 2500 |
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| 2 | B | f | 1500 |
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| 3 | C | m | 5500 |
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| 4 | D | f | 500 |
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+----+------+-----+--------+
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Output:
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+----+------+-----+--------+
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| id | name | sex | salary |
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+----+------+-----+--------+
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| 1 | A | f | 2500 |
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| 2 | B | m | 1500 |
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| 3 | C | f | 5500 |
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| 4 | D | m | 500 |
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+----+------+-----+--------+
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```
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Explanation:
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(1, A) and (3, C) were changed from 'm' to 'f'.
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(2, B) and (4, D) were changed from 'f' to 'm'.
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