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本内容遵循CC 4.0 BY-SA版权协议 本文深入解析MySQL中GROUP BY的执行阶段（FROM→WHERE→GROUP BY→SELECT→HAVING→ORDER BY），阐明其作为数据粒度转换器的本质；重点对比WHERE（行级过滤）与HAVING（组级 ...

本内容遵循CC 4.0 BY-SA版权协议 本文深入解析SQL中HAVING子句的核心作用与执行逻辑，强调其专用于分组后聚合结果的过滤，区别于WHERE的行级过滤。通过执行顺序（FROM→WHERE→GROUP BY→HAVING→SELECT ...