In daily development, SQL performance issues often become one of the main reasons for system performance bottlenecks. Especially when the amount of data is growing rapidly, inefficient SQL queries may lead to increased database load, increased query latency, and even serious problems such as system unavailability. Therefore, it is particularly important for developers to master SQL optimization techniques. This article will systematically introduce how to discover SQL performance issues and efficient SQL optimization ideas to help developers improve database query performance. Contents S…