這一篇是對前面所有關(guān)于分析函數(shù)的文章的總結(jié)：
一、統(tǒng)計方面：
復(fù)制代碼 代碼如下:
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 )
具體請參考《Oracle開發(fā)之分析函數(shù)簡介Over用法》和《Oracle開發(fā)之窗口函數(shù)》
二、排列方面：
復(fù)制代碼 代碼如下:
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 ])
具體請參考《Oracle開發(fā)之分析函數(shù)(Rank, Dense_rank, row_number)》
三、最大值/最小值查找方面：
復(fù)制代碼 代碼如下:
Min()/Max() Keep (Dense_rank First/Last [Partition by ] [Order by ])
具體請參考《Oracle開發(fā)之分析函數(shù)(Top/Bottom N、First/Last、NTile)》
四、首記錄/末記錄查找方面：
復(fù)制代碼 代碼如下:
First_value / Last_value(Sum() Over ([Patition by ] [Order by ]
Rows Between Preceding And Following ))
具體請參考《Oracle開發(fā)之窗口函數(shù)》
五、相鄰記錄之間比較方面：
復(fù)制代碼 代碼如下:
Lag(Sum(), 1) Over([Patition by ] [Order by ])
具體請參考《Oracle開發(fā)之報表函數(shù)》
以上就是Oracle分析函數(shù)總結(jié)的全部內(nèi)容，希望能給大家一個參考，也希望大家多多支持腳本之家。
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