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                            1. SQL語句不區分大小寫(要大寫全大寫,小寫全小寫),但數據庫和表的名稱則區分大小寫!
2. `NOT NULL`的意思是表中所有行的此屬性必須有一個值;如果沒有指定,該列可以為空(`NULL`);
3. `unsigned` 無符號的,意思是它只能是0或者一個正數;

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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