Update SQL 练习.md

代码块标注语言。
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CyC2018
2026-10-25 19:03:38 +08:00
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@@ -111,7 +111,7 @@ https://leetcode.com/problems/swap-salary/description/
sex 字段只有两个取值:'f' 和 'm',并且有以下规律:
```
```text
'f' ^ ('m' ^ 'f') = 'm' ^ ('f' ^ 'f') = 'm'
'm' ^ ('m' ^ 'f') = 'f' ^ ('m' ^ 'm') = 'f'
```