Home Database Mysql Tutorial Oracle数据库日期过滤方法性能比较

Oracle数据库日期过滤方法性能比较

Jun 07, 2016 pm 04:08 PM

Oracle数据库日期过滤方法性能比较。在开发SQL时,过滤日期段是经常遇到的情况,如何高效的过滤出日期段?本文通过实验进行验证:

Oracle数据库日期过滤方法性能比较

在开发SQL时,过滤日期段是经常遇到的情况,,如何高效的过滤出日期段?本文通过实验进行验证:

方法一、通过to_char将日期转换成字符串进行比较

to_char(cr.contractenddate, 'YYYY-MM-DD') >= '2014-11-13'

and to_char(cr.contractenddate, 'YYYY-MM-DD')

耗时:0.171s

方法二、通过to_date将字符串转换成日期进行比较

cr.contractenddate >= to_date('2014-11-13', 'YYYY-MM-DD')

and cr.contractenddate

耗时:0.093s

方法三、通过数据库关键字between  and 进行比较

cr.contractenddate

between to_date('2014-11-13', 'YYYY-MM-DD') and to_date('2015-11-19', 'YYYY-MM-DD')

耗时:0.078s

总结:方法一耗时体现在需要逐个比较字符串的每个字符;

方法二耗时体现在>= 和

推荐使用方法三

本文永久更新链接地址:

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