Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Community driven content discussing all aspects of software development from DevOps to design patterns. If you plan to do database development with Java and MySQL, the first thing you’ll need to do is ...

Some users have been experiencing the “Error: MySQL shutdown unexpectedly” error message when they try to start the MySQL server through the XAMPP web server ...

Make sure you have setup XAMPP stack in your system. The following guide explains how to setup XAMPP stack in Linux. Alternatively, you can use the LAMP or LEMP stacks which provides both PHP and ...

-- For the player with id 1, 5 + 6 = 11 games played by 2016-05-02, and 5 + 6 + 1 = 12 games played by 2017-06-25. -- For the player with id 3, 0 + 5 = 5 games played by 2018-07-03. -- Note that for ...

-- The cancellation rate is computed by dividing the number of canceled (by client or driver) requests with unbanned users by the total number of requests with unbanned users on that day. -- Write a ...