Analytic functions compute an aggregate value based on a group of rows. They differ fromaggregate functions in that they return multiple rows for each group. The groupof rows is called a window and is defined bythe analytic_clause. For each row, a sliding window of rows is defined.The wind...
分析函数是oracle 8中引入的一个概念,为我们分析数据提供了一种简单高效的处理方式. 官方对分析函数的说明如下: Analytic functions compute an aggregate value based on a group of rows. They differ fromaggregate functions in that they return multiple rows for each group. The groupof rows is called a ...
Analytic functions are commonly used to compute cumulative, moving, centered, andreporting aggregates. From:Analytic Functions http://docs.oracle.com/cd/E11882_01/server.112/e26088/functions004.htm#SQLRF06174 分析函数是对一组查询结果进行运算,然后获得结果,从这个意义上,分析函数非常类似于聚合函数(Ag...
Analytic functions are commonly used in data warehousing environments. In the list of analytic functions that follows, functions followed by an asterisk (*) allow the full syntax, including thewindowing_clause. 分析函数一般用于数据仓库环境。以下是分析函数列表,其中带星号的表示支持窗口语句windowing_clause...
RATIO_TO_REPORT :该函数计算expression/(sum(expression))的值,它给出相对于总数的百分比 REGR_ (Linear Regression) Functions :这些线性回归函数适合最小二乘法回归线,有9个不同的回归函数可使用 以上函数一般用于统计分析报表中,方便进行TOP N%排名的求解 ...
学习Oracle分析函数(Analytic Functions) Oracle提供了一些功能很强大的分析函数,使用这些函数可以完成可能需要存储过程来实现的需求。 分析函数计算基于一组数据行的聚合值,它们不同于聚合函数的是,它们为每一组返回多行结果。分析函数是除ORDER BY子句之外,在查询语句中最后执行的。所有的join和所有的WHERE ,GROUP BY...
REGR_ (Linear Regression) Functions* ROW_NUMBER STDDEV* STDDEV_POP* STDDEV_SAMP* SUM* VAR_POP* VAR_SAMP* VARIANCE* 以AVG为例介绍分析函数的使用: AVG也是一个聚合函数: 1 2 3 4 5 scott@TEST>selectavg(sal)fromemp; AVG(SAL) --- 2073.21429 作为...
CREATEORREPLACEVIEWsalesman_performance ( salesman_id,year, sales )ASSELECTsalesman_id,EXTRACT(YEARFROMorder_date),SUM(quantity*unit_price)FROMordersINNERJOINorder_itemsUSING(order_id)WHEREsalesman_idISNOTNULLGROUPBYsalesman_id,EXTRACT(YEARFROMorder_date);Code language:SQL (Structured Query Language)(sq...
Oracle-分析函数之连续求和sum(…) over(…) Oracle-分析函数之排序值rank()和dense_rank() Oracle-分析函数之排序后顺序号row_number() Oracle-分析函数之取上下行数据lag()和lead() 聚合函数RANK 和 dense_rank 主要的功能是计算一组数值中的排序值。 在9i版本之前,只有分析功能(analytic ),即从一个查询结...
The aggregate functionsMIN,MAX,SUM,AVG,COUNT,VARIANCE,andSTDDEV, when followed by theKEEPkeyword, can be used inconjunction with theFIRSTorLAST function to operate on a setof values from a set of rows that rank as theFIRSTorLASTwithrespect to a given sorting specification. Refer toFIRSTformore...