Hello digitcom, thank you for your feedback!! Since I need to cover various topics and there are many ways to write MySQL queries but I thought the competitiveness was lacking, I wanted to inform you about the overall architecture. Also, I wanted to provide some direction and perspective for studying, so I offered this topic. It seems like I wasn't able to give you better satisfaction, digitcom 😭😭 I will work harder to receive better reviews in the future. Thank you.