根据特定日期的数据划分其他日期的数据

时间:2012-06-17 13:43:03

标签: sql oracle analytic-functions

我现在有点困在一个问题上几个小时了。

假设我有一张包含以下数据的表格:

month          outstanding
01/05/2012     35 678 956
02/05/2012     33 678 956
03/05/2012     31 678 956
04/05/2012     27 678 956
05/05/2012     24 678 956

我需要获得比赛,比如说05/05/2012结果到那个月的第一天 例如。 2012年05月05日的优异成绩除以优异成绩01/05/2012(24 678 956/35 678 956)

我应该使用什么功能? 尝试通过to_char(trunc(a.date _,'MM'),'MM'),'DD-MM-YYYY')的结果进行分区;

似乎没有为我工作

2 个答案:

答案 0 :(得分:4)

create table temp (month date , outstanding number);
insert into temp values(to_date('01/05/2012','dd/mm/yyyy'),35678956);
insert into temp values(to_date('02/05/2012','dd/mm/yyyy'),33678956);
insert into temp values(to_date('03/05/2012','dd/mm/yyyy'),31678956);
insert into temp values(to_date('04/05/2012','dd/mm/yyyy'),27678956);
insert into temp values(to_date('05/05/2012','dd/mm/yyyy'),24678956);
insert into temp values(to_date('01/06/2012','dd/mm/yyyy'),44678956);
insert into temp values(to_date('02/06/2012','dd/mm/yyyy'),41678956);

执行FIRST_VALUE后,first record分析函数从分区中选择ORDER BY

SELECT month
      ,outstanding
      ,outstanding/(FIRST_VALUE(outstanding)
             OVER (PARTITION BY to_char(month,'mm') 
             ORDER BY month
        )) as ratio
FROM temp
ORDER BY month;

<强>输出

MONTH     OUTSTANDING      RATIO
--------- ----------- ----------
01-MAY-12    35678956          1
02-MAY-12    33678956 .943944548
03-MAY-12    31678956 .887889096
04-MAY-12    27678956 .775778193
05-MAY-12    24678956 .691695015
01-JUN-12    44678956          1
02-JUN-12    41678956 .932854295

选择了7行。

SQLFIDDLE link

答案 1 :(得分:1)

试试这个:

SELECT t1.month,
       t1.outstanding / t2.outstanding o2
FROM your_table t1
INNER JOIN
  (SELECT *
   FROM your_table
   WHERE trunc(MONTH, 'mm') = MONTH) t2 ON trunc(t1.MONTH, 'mm') = t2.MONTH