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[Oracle] Oracle开发之分析函数总结

数据库 数据库 发布于:2021-10-17 11:02 | 阅读数:474 | 评论:0

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开发之分析函数简介Over用法》和《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》
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CodeAE代码之家

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