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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: 复制代码 代码如下: 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 ) 具体请参考《Oracle开发之分析函数简介Over用法》和《Oracle开发之窗口函数》 二、排列方面: 复制代码 代码如下: 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: 复制代码 代码如下: 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: 复制代码 代码如下: 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: 复制代码 代码如下: Lag(Sum(), 1) Over([Patition by ] [Order by ])
具体请参考《Oracle开发之报表函数》 以上就是Oracle分析函数总结的全部内容,希望能给大家一个参考,也希望大家多多支持极客世界。 |
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