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條件查詢需要用到where語句，where必須放到from語句表的后面
from tableNmae是限制條件，它僅僅是限制從哪一張表里面查詢!
where 也是限制條件，它限制的是查詢這張表里面符合特殊條件的數據
此特殊條件就是表達式運算結果為true
WHERE 1 :由于1永遠都是true,所以此條件永遠成立，也就意味著所有的數據都會被查詢出來。
支持如下運算符
![](https://img.kancloud.cn/92/4c/924cfd7d2faeea720f6f0daf70598df3_571x345.png)  

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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