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A practical guide to how databases work, covering schema design, SQL, indexing, transactions, concurrency, caching, pagination, and database selection.

本内容遵循CC 4.0 BY-SA版权协议 你是不是也碰到过这种场景：一条 SQL 明明加了索引，执行计划看起来也走了索引，但线上就是慢得离谱；或者同一个查询在测试库飞快，到生产库就换了一种执行 ...

"Find the best-selling product from last year." When an AI system attempts to answer a question like this by querying a company database, even a single reference to a nonexistent item can cause the ...