Mysql索引-白红宇

Mysql索引

阅读量：93 次

发布时间：2019-02-25

本文共 1505 字，大约阅读时间需要 5 分钟。

MySQL?????????????

??????????????????????????????????????????????????????????????????????????????MySQL???

????????

???MySQL??????????????????????????????????????????????????????????????????????????????????MySQL??????????????????????????

???????

??????????????IO??????????????????????????????????????????????????B+??????????????????????????IO???

B+??????

B+????????????????????????????????????

???????????????????????????IO???

?????????????????????????????

?????????????????????

???????????????????????IO???????????????????????

B+????

?????????????

????????????????????int??????????????????????

??????????

B+???????????????????????????????????????????

??????

????????????????????????????

??????????

1. ????

?????????????????

????????????????????

?????????????????????

??????????????????????????

2. ??????

???????ID??????????????????

?????????????????????????

???????????????????????

?????????

1. ????

??????????

create table s1(  id int,  name varchar(20),  gender char(6),  email varchar(50),  primary key(id));

create index idx_name on s1(name);

???????
```
create index idx_id on s1(id);
```

?????
```
drop index idx_name on s1;
```

2. ??????

?????????????????????????

??????????????????????

??????????????????

?????????

???????????????????

??????email LIKE '%cn%'?

??????reverse(email) = 'wupeiqi'?

???????????nid != 123??nid???????????

???????

????????????????????

????*????????????

?????????????????????

??

????????????????????????????????????????IO???????????????????????????????????????????????????????????????????

转载地址：http://oqt.baihongyu.com/

你可能感兴趣的文章

Nmap端口扫描工具Windows安装和命令大全（非常详细）零基础入门到精通，收藏这篇就够了

NN&DL4.1 Deep L-layer neural network简介

查看>>

NN&DL4.3 Getting your matrix dimensions right

查看>>

NN&DL4.8 What does this have to do with the brain?

查看>>

No 'Access-Control-Allow-Origin' header is present on the requested resource.

查看>>

No Datastore Session bound to thread, and configuration does not allow creation of non-transactional

查看>>

No fallbackFactory instance of type class com.ruoyi---SpringCloud Alibaba_若依微服务框架改造---工作笔记005

查看>>

No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalanc

查看>>

No mapping found for HTTP request with URI [/...] in DispatcherServlet with name ...的解决方法

查看>>

No module named cv2

查看>>

No module named tensorboard.main在安装tensorboardX的时候遇到的问题

查看>>

No module named ‘MySQLdb‘错误解决No module named ‘MySQLdb‘错误解决

查看>>

No new migrations found. Your system is up-to-date.

查看>>

No qualifying bean of type XXX found for dependency XXX.

查看>>

No resource identifier found for attribute 'srcCompat' in package的解决办法

查看>>

No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

查看>>

NO.23 ZenTaoPHP目录结构

查看>>

NO32 网络层次及OSI7层模型--TCP三次握手四次断开--子网划分

查看>>