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                            為什么要使用IN操作符?其優點如下

* 在有很多合法選項時,IN操作符的語法更清楚,更直觀

* 在與其他and和OR操作符組合使用IN時,求值順序更容易管理

* IN操作符一般比一組OR操作符執行得更快

* IN的最大優點是可以包含其他select語句,能夠更動態的建議where子句
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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