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chore: format markdown code. (#42)

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* format: fix markdown

* update: fix markdown

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* chore: add tab -> 4 space

* chore: fix tab -> 2 in the .editorconfig
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@ -3,7 +3,6 @@ MySQL 备忘清单
本备忘单旨在快速理解 [MySQL](https://mysql.com) 所涉及的主要概念，提供了最常用的SQL语句，供您参考。
入门
---
@ -65,9 +64,9 @@ mysql -h <host> -u <user> -p [db_name]
`SHOW TABLES;` | 列出当前数据库的表
`SHOW FIELDS FROM` t`;` | 表的列表字段
`DESC` t`;` | 显示表格结构
`SHOW CREATE TABLE `t`;` | 显示创建表sql
`TRUNCATE TABLE `t`;` | 删除表中的所有数据
`DROP TABLE `t`;` | 删除表格
`SHOW CREATE TABLE`t`;` | 显示创建表sql
`TRUNCATE TABLE`t`;` | 删除表中的所有数据
`DROP TABLE`t`;` | 删除表格
#### Proccess
@ -388,6 +387,7 @@ CREATE TABLE t(
CHECK(c1> 0 AND c1 >= c2)
);
```
c2列中的设置值不为NULL
```sql
@ -556,7 +556,6 @@ DROP INDEX idx_name;
MySQL 数据类型
---------
### Strings
| - | - |
@ -573,16 +572,15 @@ MySQL 数据类型
| `ENUM` | One of preset options |
| `SET` | Selection of preset options |
### Date & time
| Data Type | Format |
|-------------|---------------------|
| `DATE ` | yyyy-MM-dd |
| `TIME ` | hh:mm:ss |
| `DATETIME ` | yyyy-MM-dd hh:mm:ss |
| `DATE` | yyyy-MM-dd |
| `TIME` | hh:mm:ss |
| `DATETIME` | yyyy-MM-dd hh:mm:ss |
| `TIMESTAMP` | yyyy-MM-dd hh:mm:ss |
| `YEAR ` | yyyy |
| `YEAR` | yyyy |
### Numeric
@ -602,4 +600,4 @@ MySQL 数据类型
- [SQL 基础教程](http://www.w3school.com.cn/sql/index.asp) _(w3school.com.cn)_
- [SQL 语句教程](http://www.1keydata.com/cn/sql/sql-count.php) _(1keydata.com)_
- [21分钟 MySQL 基础入门](https://jaywcjlove.github.io/mysql-tutorial/21-minutes-MySQL-basic-entry.html) _(jaywcjlove.github.io)_
- [21分钟 MySQL 基础入门](https://jaywcjlove.github.io/mysql-tutorial/21-minutes-MySQL-basic-entry.html) _(jaywcjlove.github.io)_