Find Users With Valid E-Mails - TRY AGAIN

Author: Viniciuscoding

Leetcode_1517.sql

@@ -0,0 +1,57 @@
+/*
+Find Users With Valid E-Mails
+
+Table: Users
+
++---------------+---------+
+| Column Name   | Type    |
++---------------+---------+
+| user_id       | int     |
+| name          | varchar |
+| mail          | varchar |
++---------------+---------+
+user_id is the primary key for this table.
+This table contains information of the users signed up in a website. Some e-mails are invalid.
+ 
+
+Write an SQL query to find the users who have valid emails.
+
+A valid e-mail has a prefix name and a domain where: 
+
+The prefix name is a string that may contain letters (upper or lower case), digits, underscore '_', period '.' and/or dash '-'.
+The prefix name must start with a letter. The domain is '@leetcode.com'.
+
+Return the result table in any order.
+
+The query result format is in the following example.
+ 
+Users
++---------+-----------+-------------------------+
+| user_id | name      | mail                    |
++---------+-----------+-------------------------+
+| 1       | Winston   | [email protected]    |
+| 2       | Jonathan  | jonathanisgreat         |
+| 3       | Annabelle | [email protected]     |
+| 4       | Sally     | [email protected] |
+| 5       | Marwan    | quarz#[email protected] |
+| 6       | David     | [email protected]       |
+| 7       | Shapiro   | [email protected]     |
++---------+-----------+-------------------------+
+
+Result table:
++---------+-----------+-------------------------+
+| user_id | name      | mail                    |
++---------+-----------+-------------------------+
+| 1       | Winston   | [email protected]    |
+| 3       | Annabelle | [email protected]     |
+| 4       | Sally     | [email protected] |
++---------+-----------+-------------------------+
+The mail of user 2 doesn't have a domain.
+The mail of user 5 has # sign which is not allowed.
+The mail of user 6 doesn't have leetcode domain.
+The mail of user 7 starts with a period.
+*/
+
+SELECT *
+FROM Users 
+WHERE mail REGEXP '^[a-zA-Z]{1}[a-zA-Z0-9_.-]*@leetcode.com$'