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分析了 MySQL 子查询的各种出现位置（目标列、FROM、WHERE、JOIN/ON）和类型（相关/非相关、IN/EXISTS 等），并探讨了子查询的优化方法，如子查询合并和子查询展开（反嵌套），最后通过 EXPLAIN 演示了 MySQL 对不同类型子查询（如 NOT IN, ALL, SOME）的优化策略。
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