027. the gatekeeper: implementing data validation rules (ks4)
Learn how to protect database integrity by implementing data validation rules that check for errors and stop invalid information.
Have you ever tried to type your name into a website, but it told you "numbers are not allowed"? That is data validation in action. Without strict rules, people might accidentally type letters into phone number boxes or dates that do not exist. We are going to build the ultimate digital gatekeeper, learning how to write rules that catch mistakes and keep our databases completely accurate.
Last modified: March 25th, 2026
