in索引失效_内存溢出

mysql

MySQL中or、in、union与索引优化详析

本文缘起自《一分钟了解索引技巧》的作业题。假设订单业务表结构为：order(oid, date, uid, status, money, time, …)其中：oid，订单ID，主键date，下单日期，有普通索引，管理后台经常按照date

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MySQL中or、in、union与索引优化详析