数据库：MySQL数据库使用踩坑记录

原創 李先森LeeCode 2020-04-02 10:42
  1. 如果表的数据量达到百万甚至千万以上的级别，则查询速度会减慢，此时就应该考虑在表的某些字段建立索引
  2. MySQL 的 IN 查询，在数据量大的时候更应该建立索引提升查询速度，但是要注意， MySQL5.5版本以前 IN 查询是不走索引的， 5.5版本及以后版本 IN 查询走索引。所以你希望 IN 查询能走索引提升查询速度，部署的时候要选择5.5及以上的 MySQL 版本
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