Oracle开发之分析函数总结

这一篇是对前面所有关于分析函数的文章的总结:

一、统计方面:

Sum() Over ([Partition by ] [Order by ])
  
Sum() Over ([Partition by ] [Order by ] 
     Rows Between  Preceding And  Following)
      
Sum() Over ([Partition by ] [Order by ]
     Rows Between  Preceding And Current Row)
  
Sum() Over ([Partition by ] [Order by ]
     Range Between Interval ” ‘Day’ Preceding
                    And Interval ” ‘Day’ Following )

具体请参考《Oracle开发之窗口函数

二、排列方面:

Rank() Over ([Partition by ] [Order by ] [Nulls First/Last])
  
  Dense_rank() Over ([Patition by ] [Order by ] [Nulls First/Last])
  
Row_number() Over ([Partitionby ] [Order by ] [Nulls First/Last])
  
Ntile() Over ([Partition by ] [Order by ])

具体请参考《Oracle开发之分析函数(Rank, Dense_rank, row_number)

三、最大值/最小值查找方面:

Min()/Max() Keep (Dense_rank First/Last [Partition by ] [Order by ])

具体请参考《Oracle开发之分析函数(Top/Bottom N、First/Last、NTile)

四、首记录/末记录查找方面:

First_value / Last_value(Sum() Over ([Patition by ] [Order by ]
       Rows Between  Preceding And  Following  ))

具体请参考《Oracle开发之窗口函数

五、相邻记录之间比较方面:

Lag(Sum(), 1) Over([Patition by ] [Order by ])

具体请参考《Oracle开发之报表函数

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