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Update SQL 练习.md
代码块标注语言。
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@@ -111,7 +111,7 @@ https://leetcode.com/problems/swap-salary/description/
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sex 字段只有两个取值:'f' 和 'm',并且有以下规律:
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```
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```text
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'f' ^ ('m' ^ 'f') = 'm' ^ ('f' ^ 'f') = 'm'
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'm' ^ ('m' ^ 'f') = 'f' ^ ('m' ^ 'm') = 'f'
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```
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