oracle 分析函數 - 總結
阿新 • • 發佈:2017-08-20
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一、統計方面: 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 AndInterval ‘‘ ‘Day‘ Following ) 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 ]) 三、最大值/最小值查找方面: Min()/Max() Keep (Dense_rank First/Last [Partition by ] [Order by ]) 四、首記錄/末記錄查找方面: First_value / Last_value(Sum() Over ([Patition by ] [Order by ] Rows Between Preceding And Following )) 五、相鄰記錄之間比較方面: Lag(Sum(), 1) Over([Patition by ] [Order by ])
oracle 分析函數 - 總結