WHERE語句
===
使用where語句來設定select,update,delete語句數據抽出條件
## 實戰
```
> select * from users;
> select * from users where score > 20 ;
> select * from users where score < 30;
> select * from users where score > 20 and score < 30;
> select * from users where team = '勇士';
> select * from users where team != '勇士';
> select * from users where player like '阿%'; # 以阿開頭
> select * from users where player like '阿_'; # 兩個字符
```