To query a user's mobile phone and WeChat number, the following SQL statement can be used.

Mastering Excel goes far beyond SUM and VLOOKUP. By learning functions like COUNT, AVERAGE, SUMIF, SUBTOTAL, XLOOKUP, and INDEX/MATCH, you can find opportunities to improve your Excel sheet. Some ...

Huntress analysts discovered a previously unseen ransomware variant, Obscura, spreading from a victim company's domain controller. Learn how Obscura works—and what it means for defenders—in this ...

This project is an Employee Management System built using Python with a MySQL database as the backend. The system allows users to manage employee records effectively, performing CRUD (Create, Read, ...

These solutions are my own work and were created for educational purposes on HackerRank. They may not be the most optimal solutions, but they passed HackerRank’s test cases.