數據庫：MySQL數據庫使用踩坑記錄

原創 李先森LeeCode 2020-04-02 10:42
  1. 如果表的數據量達到百萬甚至千萬以上的級別，則查詢速度會減慢，此時就應該考慮在表的某些字段建立索引
  2. MySQL 的 IN 查詢，在數據量大的時候更應該建立索引提升查詢速度，但是要注意， MySQL5.5版本以前 IN 查詢是不走索引的， 5.5版本及以後版本 IN 查詢走索引。所以你希望 IN 查詢能走索引提升查詢速度，部署的時候要選擇5.5及以上的 MySQL 版本
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