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82 lines
6.9 KiB
JSON
82 lines
6.9 KiB
JSON
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"questionId": "196",
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"questionFrontendId": "196",
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"categoryTitle": "Database",
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"boundTopicId": 1235,
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"title": "Delete Duplicate Emails",
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"titleSlug": "delete-duplicate-emails",
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"content": "<p>Table: <code>Person</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type |\n+-------------+---------+\n| id | int |\n| email | varchar |\n+-------------+---------+\nid is the primary key column for this table.\nEach row of this table contains an email. The emails will not contain uppercase letters.\n</pre>\n\n<p> </p>\n\n<p>Write an SQL query to <strong>delete</strong> all the duplicate emails, keeping only one unique email with the smallest <code>id</code>. Note that you are supposed to write a <code>DELETE</code> statement and not a <code>SELECT</code> one.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nPerson table:\n+----+------------------+\n| id | email |\n+----+------------------+\n| 1 | john@example.com |\n| 2 | bob@example.com |\n| 3 | john@example.com |\n+----+------------------+\n<strong>Output:</strong> \n+----+------------------+\n| id | email |\n+----+------------------+\n| 1 | john@example.com |\n| 2 | bob@example.com |\n+----+------------------+\n<strong>Explanation:</strong> john@example.com is repeated two times. We keep the row with the smallest Id = 1.\n</pre>\n",
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"translatedTitle": "删除重复的电子邮箱",
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"translatedContent": "<p>表: <code>Person</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type |\n+-------------+---------+\n| id | int |\n| email | varchar |\n+-------------+---------+\nid是该表的主键列。\n该表的每一行包含一封电子邮件。电子邮件将不包含大写字母。\n</pre>\n\n<p> </p>\n\n<p>编写一个SQL查询来 <strong>删除</strong> 所有重复的电子邮件，只保留一个id最小的唯一电子邮件。</p>\n\n<p>以 <strong>任意顺序</strong> 返回结果表。</p>\n\n<p>查询结果格式如下所示。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong> \nPerson 表:\n+----+------------------+\n| id | email |\n+----+------------------+\n| 1 | john@example.com |\n| 2 | bob@example.com |\n| 3 | john@example.com |\n+----+------------------+\n<strong>输出:</strong> \n+----+------------------+\n| id | email |\n+----+------------------+\n| 1 | john@example.com |\n| 2 | bob@example.com |\n+----+------------------+\n<strong>解释:</strong> john@example.com重复两次。我们保留最小的Id = 1。</pre>\n",
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"difficulty": "Easy",
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"code": "# Please write a DELETE statement and DO NOT write a SELECT statement.\n# Write your MySQL query statement below",
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"sampleTestCase": "{\"headers\": {\"Person\": [\"id\", \"email\"]}, \"rows\": {\"Person\": [[1, \"john@example.com\"], [2, \"bob@example.com\"], [3, \"john@example.com\"]]}}",
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"Truncate table Person",
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"insert into Person (id, email) values ('1', 'john@example.com')",
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"insert into Person (id, email) values ('2', 'bob@example.com')",
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"insert into Person (id, email) values ('3', 'john@example.com')"
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"exampleTestcases": "{\"headers\": {\"Person\": [\"id\", \"email\"]}, \"rows\": {\"Person\": [[1, \"john@example.com\"], [2, \"bob@example.com\"], [3, \"john@example.com\"]]}}",
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