task: #3436

README.md

@@ -152,6 +152,7 @@ Useful for preparing for technical interviews and improving your SQL skills.
     - [1965. Employees With Missing Information](./leetcode/easy/1965.%20Employees%20With%20Missing%20Information.sql)
     - [1978. Employees Whose Manager Left the Company](./leetcode/easy/1978.%20Employees%20Whose%20Manager%20Left%20the%20Company.sql)
     - [2356. Number of Unique Subjects Taught by Each Teacher](./leetcode/easy/2356.%20Number%20of%20Unique%20Subjects%20Taught%20by%20Each%20Teacher.sql)
+    - [3436. Find Valid Emails](./leetcode/easy/3436.%20Find%20Valid%20Emails.sql)
 2. [Medium](./leetcode/medium/)
     - [176. Second Highest Salary](./leetcode/medium/176.%20Second%20Highest%20Salary.sql)
     - [180. Consecutive Numbers](./leetcode/medium/180.%20Consecutive%20Numbers.sql)

leetcode/easy/3436. Find Valid Emails.sql

@@ -0,0 +1,29 @@
+/*
+Question 3436. Find Valid Emails
+Link: https://leetcode.com/problems/find-valid-emails/description/?envType=problem-list-v2&envId=database
+
+Table: Users
+
++-----------------+---------+
+| Column Name     | Type    |
++-----------------+---------+
+| user_id         | int     |
+| email           | varchar |
++-----------------+---------+
+(user_id) is the unique key for this table.
+Each row contains a user's unique ID and email address.
+Write a solution to find all the valid email addresses. A valid email address meets the following criteria:
+
+It contains exactly one @ symbol.
+It ends with .com.
+The part before the @ symbol contains only alphanumeric characters and underscores.
+The part after the @ symbol and before .com contains a domain name that contains only letters.
+Return the result table ordered by user_id in ascending order.
+*/
+
+SELECT 
+    user_id,
+    email
+FROM Users
+WHERE email ~ '^([a-zA-Z0-9]?[_]?[a-zA-Z0-9]?)*@[a-zA-Z]+\.com$'
+ORDER BY user_id ASC