The instructor explains things well, but I still don't quite understand the subquery logic.

Nope, no English.

Thank you for the useful lecture on understanding SQL.

It's helpful.

Problem-based SQL lectures are always the best, I think. I'm planning to purchase and take database-related courses as well.

Overall, it often feels like the videos were shot spontaneously rather than with extensive preparation. The recording environment seems particularly poor. There are frequently mechanical sounds or noise that seem disruptive. Content-wise, you explained things kindly, so I was able to understand well.

Your slow explanation put my mind at ease. It's difficult, but I'll try my best.

Good

Explains clearly.

It was a beneficial time because I could learn about window functions and other SQL syntax, especially user-defined functions!