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                            在mysql中,存儲引擎用類似的方法使用索引,其先在索引中找到對應值,然后根據匹配的索引記錄找到對應的數據行

~~~
select first_name from sakila.actor where actor_id = 5;
~~~

如果在actor_id列上建有索引,則mysql將使用該索引找到actor_id為5的行,也就是說,mysql先在索引上按值進行查找,然后返回所有包含該值的數據行


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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