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修复错误

pull/151/head
liushaohui1 2022-06-21 19:11:25 +08:00 committed by 安然
parent f0c6cc35df
commit ceaff703c2
1 changed files with 4 additions and 4 deletions
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docs/mysql-2.md
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@ -189,19 +189,19 @@
![整体流程](https://raw.githubusercontent.com/qiurunze123/imageall/master/mysql2.png)
有索引可用
无索引可用
EXPLAIN SELECT * FROM `miaosha_mysql_test` WHERE mobile='166011' ;
![整体流程](https://raw.githubusercontent.com/qiurunze123/imageall/master/mysql3.png)
无索引可用
有索引可用
EXPLAIN SELECT * FROM `miaosha_mysql_test` WHERE userid='2222' or mobile='166011' ;
![整体流程](https://raw.githubusercontent.com/qiurunze123/imageall/master/mysql4.png)
无索引可用
有索引可用
![整体流程](https://raw.githubusercontent.com/qiurunze123/imageall/master/mysql5.png)
@ -250,4 +250,4 @@
3、如果where条件中是OR关系，加索引不起作用
4、联合索引比对每个列分别建索引更有优势，因为索引建立得越多就越占磁盘空间，
在更新数据的时候速度会更慢。另外建立多列索引时，顺序也是需要注意的，
应该将严格的索引放在前面，这样筛选的力度会更大，效率更高。
应该将严格的索引放在前面，这样筛选的力度会更大，效率更高。