表fin_invoice有一列created_date DATETIME，对该列已建索引，且数据库里有1.7万条记录，对比如下：
| 语句 | explain输出中的type列 |
|---|---|
| explain SELECT t.* FROM fin_invoice t where t.created_date >= ‘2019-10-01 00:00:00’ AND t.created_date <= ‘2019-10-31 23:59:59’ | range |
| explain SELECT t.* FROM fin_invoice t where t.created_date >= ‘20191001 00:00:00’ AND t.created_date <= ‘20191031 23:59:59’ | ALL |
| explain SELECT t.* FROM fin_invoice t where t.created_date between ‘2019-10-01 00:00:00’ AND ‘2019-10-31 23:59:59’ | range |
| explain SELECT t.* FROM fin_invoice t where t.created_date between ‘20191001 00:00:00’ AND ‘20191031 23:59:59’ | ALL |
| explain SELECT t.* FROM fin_invoice t where t.created_date between ‘2019-10-01 00:00:00’ AND ‘2019-10-01 23:59:59’ 注意是同一天 | range |
| explain SELECT t.* FROM fin_invoice t where t.created_date between ‘20191001 00:00:00’ AND ‘20191001 23:59:59’ 注意是同一天 | ALL |
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
文章由极客之音整理，本文链接：https://www.bmabk.com/index.php/post/17270.html
