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sql优化是一个大家都比较关注的热门话题,无论你在面试,还是工作中,都很有可能会遇到。 如果某天你负责的某个线上接口,出现了性能问题,需要做优化。那么你首先想到的很有可能是优化sql语句,因为它的改造成本相对于代码来说也要小得多。 最近无意间获得一份BAT大厂大佬写的刷题笔记. 熟悉如何优化SQL语句,以期达到最高查询效率,了解事务、锁、索引、约束、视图、元数据等概念,并且学会使用hive sql、spark sql、pymysql等工具; 数据分析人员最好是能达到第三个层次,这样基本可以算一个90分的sqler。 13.并不是所有索引对查询都有效,SQL是根据表中数据来进行查询优化的,当索引列有大量数据重复时,SQL查询可能不会去利用索引,如一表中有字段sex,male、female几乎各一半,那么即使在sex上建了索引也对查询效率起不了作用。 Mysql in大量数据导致查询速度慢,应该怎么解决?例:select count(id) from t where create_id in …
全模糊查询是无法优化的,一定要使用的话建议使用搜索引擎。 十九、使用explain分析你SQL执行计划 1、type system:表仅有一行,基本用不到; const:表最多一行数据配合,主键查询时触发较多; eq_ref:对于每个来自于前面的表的行组合,从该表中读取一行。
SQL优化,算是数据库优化的一个子集。 因此,吹大牛的候选人简历上,会赫然写着”擅长MySQL数据库优化“,而吹小牛的候选人简历上,往往会写”擅长SQL优化“。 既然SQL优化的核心在于索引,那么如何设计出高效的索引就成了一门艺术。 这并非有固定的标准答案,而是在理解业务和数据分布基础上的权衡。