"content":"<p>Table: <code>Users</code></p>\n\n<pre>\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</pre>\n\n<p> </p>\n\n<p>Write a solution to find the users who have <strong>valid emails</strong>.</p>\n\n<p>A valid e-mail has a prefix name and a domain where:</p>\n\n<ul>\n\t<li><strong>The prefix name</strong> is a string that may contain letters (upper or lower case), digits, underscore <code>'_'</code>, period <code>'.'</code>, and/or dash <code>'-'</code>. The prefix name <strong>must</strong> start with a letter.</li>\n\t<li><strong>The domain</strong> is <code>'@leetcode.com'</code>.</li>\n</ul>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \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+---------+-----------+-------------------------+\n<strong>Output:</strong> \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<strong>Explanation:</strong> \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</pre>\n",
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"Create table If Not Exists Users (user_id int, name varchar(30), mail varchar(50))",
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"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')"
],
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