{ "data": { "question": { "questionId": "1664", "questionFrontendId": "1517", "categoryTitle": "Database", "boundTopicId": 336736, "title": "Find Users With Valid E-Mails", "titleSlug": "find-users-with-valid-e-mails", "content": "

Table: Users

\n\n
\n+---------------+---------+\n| Column Name   | Type    |\n+---------------+---------+\n| user_id       | int     |\n| name          | varchar |\n| mail          | varchar |\n+---------------+---------+\nuser_id is the primary key (column with unique values) for this table.\nThis table contains information of the users signed up in a website. Some e-mails are invalid.\n
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Write a solution to find the users who have valid emails.

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A valid e-mail has a prefix name and a domain where:

\n\n\n\n

Return the result table in any order.

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The result format is in the following example.

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\n

Example 1:

\n\n
\nInput: \nUsers table:\n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 2       | Jonathan  | jonathanisgreat         |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n| 5       | Marwan    | quarz#2020@leetcode.com |\n| 6       | David     | david69@gmail.com       |\n| 7       | Shapiro   | .shapo@leetcode.com     |\n+---------+-----------+-------------------------+\nOutput: \n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n+---------+-----------+-------------------------+\nExplanation: \nThe mail of user 2 does not have a domain.\nThe mail of user 5 has the # sign which is not allowed.\nThe mail of user 6 does not have the leetcode domain.\nThe mail of user 7 starts with a period.\n
\n", "translatedTitle": "查找拥有有效邮箱的用户", "translatedContent": "

表: Users

\n\n
\n+---------------+---------+\n| Column Name   | Type    |\n+---------------+---------+\n| user_id       | int     |\n| name          | varchar |\n| mail          | varchar |\n+---------------+---------+\nuser_id 是该表的主键（具有唯一值的列）。\n该表包含了网站已注册用户的信息。有一些电子邮件是无效的。\n
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编写一个解决方案，以查找具有有效电子邮件的用户。

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一个有效的电子邮件具有前缀名称和域，其中：

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    \n\t
  1.  前缀 名称是一个字符串，可以包含字母（大写或小写），数字，下划线 '_' ，点 '.' 和/或破折号 '-' 。前缀名称 必须 以字母开头。
    2. \n\t
  2. 域 为 '@leetcode.com' 。
    3. \n
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以任何顺序返回结果表。

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结果的格式如以下示例所示：

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示例 1：

\n\n
\n输入：\nUsers 表:\n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 2       | Jonathan  | jonathanisgreat         |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n| 5       | Marwan    | quarz#2020@leetcode.com |\n| 6       | David     | david69@gmail.com       |\n| 7       | Shapiro   | .shapo@leetcode.com     |\n+---------+-----------+-------------------------+\n输出：\n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n+---------+-----------+-------------------------+\n解释：\n用户 2 的电子邮件没有域。 \n用户 5 的电子邮件带有不允许的 '#' 符号。\n用户 6 的电子邮件没有 leetcode 域。 \n用户 7 的电子邮件以点开头。\n
\n", "isPaidOnly": false, "difficulty": "Easy", "likes": 75, "dislikes": 0, "isLiked": null, "similarQuestions": "[]", "contributors": [], "langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"typescript\": false, \"bash\": false, \"php\": false, \"swift\": false, \"kotlin\": false, \"dart\": false, \"golang\": false, \"ruby\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"rust\": false, \"racket\": false, \"erlang\": false, \"elixir\": false, \"pythondata\": false, \"react\": false, \"vanillajs\": false, \"postgresql\": false}", "topicTags": [ { "name": "Database", "slug": "database", "translatedName": "数据库", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "MySQL", "langSlug": "mysql", "code": "# Write your MySQL query statement below", "__typename": "CodeSnippetNode" }, { "lang": "MS SQL Server", "langSlug": "mssql", "code": "/* Write your T-SQL query statement below */", "__typename": "CodeSnippetNode" }, { "lang": "Oracle", "langSlug": "oraclesql", "code": "/* Write your PL/SQL query statement below */", "__typename": "CodeSnippetNode" }, { "lang": "Pandas", "langSlug": "pythondata", "code": "import pandas as pd\n\ndef valid_emails(users: pd.DataFrame) -> pd.DataFrame:\n ", "__typename": "CodeSnippetNode" }, { "lang": "PostgreSQL", "langSlug": "postgresql", "code": "-- Write your PostgreSQL query statement below", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"18.2K\", \"totalSubmission\": \"34.3K\", \"totalAcceptedRaw\": 18212, \"totalSubmissionRaw\": 34327, \"acRate\": \"53.1%\"}", "hints": [], "solution": null, "status": null, "sampleTestCase": "{\"headers\":{\"Users\":[\"user_id\",\"name\",\"mail\"]},\"rows\":{\"Users\":[[1,\"Winston\",\"winston@leetcode.com\"],[2,\"Jonathan\",\"jonathanisgreat\"],[3,\"Annabelle\",\"bella-@leetcode.com\"],[4,\"Sally\",\"sally.come@leetcode.com\"],[5,\"Marwan\",\"quarz#2020@leetcode.com\"],[6,\"David\",\"david69@gmail.com\"],[7,\"Shapiro\",\".shapo@leetcode.com\"]]}}", "metaData": "{\"mysql\":[\"Create table If Not Exists Users (user_id int, name varchar(30), mail varchar(50))\"],\"mssql\":[\"Create table Users (user_id int, name varchar(30), mail varchar(50))\"],\"oraclesql\":[\"Create table Users (user_id int, name varchar(30), mail varchar(50))\"],\"database\":true,\"name\":\"valid_emails\",\"pythondata\":[\"Users = pd.DataFrame([], columns=['user_id', 'name', 'mail']).astype({'user_id':'int64', 'name':'object', 'mail':'object'})\"],\"postgresql\":[\"\\nCreate table If Not Exists Users (user_id int, name varchar(30), mail varchar(50))\"],\"database_schema\":{\"Users\":{\"user_id\":\"INT\",\"name\":\"VARCHAR(30)\",\"mail\":\"VARCHAR(50)\"}}}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [ "Create table If Not Exists Users (user_id int, name varchar(30), mail varchar(50))", "Truncate table Users", "insert into Users (user_id, name, mail) values ('1', 'Winston', 'winston@leetcode.com')", "insert into Users (user_id, name, mail) values ('2', 'Jonathan', 'jonathanisgreat')", "insert into Users (user_id, name, mail) values ('3', 'Annabelle', 'bella-@leetcode.com')", "insert into Users (user_id, name, mail) values ('4', 'Sally', 'sally.come@leetcode.com')", "insert into Users (user_id, name, mail) values ('5', 'Marwan', 'quarz#2020@leetcode.com')", "insert into Users (user_id, name, mail) values ('6', 'David', 'david69@gmail.com')", "insert into Users (user_id, name, mail) values ('7', 'Shapiro', '.shapo@leetcode.com')" ], "enableRunCode": true, "envInfo": "{\"mysql\":[\"MySQL\",\"

\\u7248\\u672c\\uff1aMySQL 8.0<\\/code><\\/p>\"],\"mssql\":[\"MS SQL Server\",\"

mssql server 2019.<\\/p>\"],\"oraclesql\":[\"Oracle\",\"

Oracle Sql 11.2.<\\/p>\"],\"pythondata\":[\"Pandas\",\"

Python 3.10 with Pandas 2.0.2 and NumPy 1.25.0<\\/p>\"],\"postgresql\":[\"PostgreSQL\",\"

PostgreSQL 16<\\/p>\"]}", "book": null, "isSubscribed": false, "isDailyQuestion": false, "dailyRecordStatus": null, "editorType": "CKEDITOR", "ugcQuestionId": null, "style": "LEETCODE", "exampleTestcases": "{\"headers\":{\"Users\":[\"user_id\",\"name\",\"mail\"]},\"rows\":{\"Users\":[[1,\"Winston\",\"winston@leetcode.com\"],[2,\"Jonathan\",\"jonathanisgreat\"],[3,\"Annabelle\",\"bella-@leetcode.com\"],[4,\"Sally\",\"sally.come@leetcode.com\"],[5,\"Marwan\",\"quarz#2020@leetcode.com\"],[6,\"David\",\"david69@gmail.com\"],[7,\"Shapiro\",\".shapo@leetcode.com\"]]}}", "__typename": "QuestionNode" } } }