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                            # SQL 語句

應用程序對數據庫的訪問是通過SQL語句完成的，在SQL中，可以分為

* 數據定義語言（DDL）
* 數據操作語言（DML）
  * 修改數據的語句
  * **查詢數據的語句**（ DQL 重點）




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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