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                            單選項字符串數據類型,它非常適合存儲表單的”單選項值”;

它設定的時候,是需要給定”固定的幾個選項”,然后存儲的時候,就只存儲其中一個值

形式如下:enum(“選項1”,”選項2”,”選項3”,…)

實際內部:這些字符串選項值對應如下數字值:1,2,3,4,5…..最多65535個選項

寫入形式:可以用該字符串,也可以對應的數字,如果存儲的是null是以整數0進行存儲的


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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