Oracle开发专题之:分析函数总结
2013-11-26 15:16
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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:
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开发专题之:分析函数(OVER)》和《Oracle开发专题之: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开发专题之:分析函数2》
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开发专题之:分析函数3》
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开发专题之: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开发专题之:报表函数》
-------------------------------------------------------------
生活就像打牌,不是要抓一手好牌,而是要尽力打好一手烂牌。
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开发专题之:分析函数(OVER)》和《Oracle开发专题之: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开发专题之:分析函数2》
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开发专题之:分析函数3》
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开发专题之: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开发专题之:报表函数》
-------------------------------------------------------------
生活就像打牌,不是要抓一手好牌,而是要尽力打好一手烂牌。
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