In the world of data analysis, “slow queries” are like workplace headaches that just won’t go away.
Recently, I’ve met quite a few data analysts who complain about queries running for hours without results, leaving them staring helplessly at the spinning progress bar. Last week, I ran into an old friend who was struggling with the performance of a large table JOIN.

“The query speed is slower than a snail, and my boss is driving me crazy…” he said with a frustrated look.
As a seasoned database optimization expert with years of experience on the front lines, I couldn’t help but smile: “JOIN performance is slow because you don’t understand its nature. Just like in martial arts, understanding how to use force effectively can make all the difference.”