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                            ### 自然連接
自然連接是把同名列通過等值測試連接起來的，同名列可以有多個。
內連接和自然連接的區別：內連接提供連接的列，而自然連接自動連接所有同名列。

~~~
SELECT A.value, B.value
FROM tablea AS A NATURAL JOIN tableb AS B;
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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