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5 年
MySQL 索引设计(函数索引)-爱可生
本篇主要介绍 MySQL 的函数索引(也叫表达式索引)。 通常来讲,索引都是基于字段本身或者字段前缀(第 20 篇),而函数索引是基于字段本身加上函数、操作符、表达式等计算而来。如果将表达式或者操作符也看做函数的话,简单来说,这样的索引就可以统称 ...
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