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表名區分大小寫
分組后，聚集函數作用于每個組。如avg和count
顯示表中唯一值用group by的速度比用distinct的速度快。
having count(*)  >10 的意思是篩選出組內條目數>10的組
having avg(*) > 50000,保留平均數 > 50000的組
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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