sql 如何从百万条记录中删除某会员发布的N条记录-sql检索效率问
第一次执行，内存里没有缓存这些数据，需要从硬盘上读取，所以会很慢。第二次执行，数据已经进入了内存，就不需要从硬盘上读取，直接从内存里读，所以很快
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