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                            看圖就可以了發現；
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這里name字段是varchar類型的。int類型的是沒有問題的
這個場景 是某次去聽php大會。葉金榮講的，假如存手機號的字段是varchar加了索引，搜的時候沒有帶引號，就會用不到索引。然后bigint保平安。
主要原因是因為隱式轉換。mysql 那邊是varchar ，sql寫的是int ，mysql 會進行隱式轉換，這樣就走不了索引的

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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