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45 lines
982 B
HTML
45 lines
982 B
HTML
<p><meta charset="UTF-8" /></p>
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<p>表: <code>Person</code></p>
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<pre>
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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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| email | varchar |
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+-------------+---------+
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id 是该表的主键（具有唯一值的列）。
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此表的每一行都包含一封电子邮件。电子邮件不包含大写字母。
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</pre>
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<p> </p>
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<p>编写解决方案来报告所有重复的电子邮件。 请注意，可以保证电子邮件字段不为 NULL。</p>
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<p>以 <strong>任意顺序 </strong>返回结果表。</p>
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<p>结果格式如下例。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入:</strong>
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Person 表:
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+----+---------+
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| id | email |
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+----+---------+
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| 1 | a@b.com |
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| 2 | c@d.com |
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| 3 | a@b.com |
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+----+---------+
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<strong>输出:</strong>
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+---------+
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| Email |
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+---------+
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| a@b.com |
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+---------+
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<strong>解释:</strong> a@b.com 出现了两次。</pre>
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