Oracle SQL Analytic查询-递归类似电子表格的运行总计 [英] Oracle SQL Analytic query - recursive spreadsheet-like running total
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问题描述
我有以下数据,由A
值组成,按MM
(月)排序.
I have the following data, composed of the A
value, ordered by MM
(month).
B
列以类似于电子表格的方式计算为GREATEST(current value of A + previous value of B, 0)
.
The B
column is computed as GREATEST(current value of A + previous value of B, 0)
in a spreadsheet-like fashion.
如何使用SQL查询计算B
?
How can I compute B
using a SQL Query?
- I tried using Analytic Functions, but I was unable to succeed.
- I know there is the Model Clause; I found a similar example, but I don't know where to begin.
我正在使用Oracle 10g,因此不能使用递归查询.
I am using Oracle 10g, therefore I cannot use recursive queries.
这是我的测试数据:
MM | A | B
-----------+--------+------
2012-01-01 | 800 | 800
2012-02-01 | 1900 | 2700
2012-03-01 | 1750 | 4450
2012-04-01 | -20000 | 0
2012-05-01 | 900 | 900
2012-06-01 | 3900 | 4800
2012-07-01 | -2600 | 2200
2012-08-01 | -2600 | 0
2012-09-01 | 2100 | 2100
2012-10-01 | -2400 | 0
2012-11-01 | 1100 | 1100
2012-12-01 | 1300 | 2400
这是表定义":
select t.* from (
select date'2012-01-01' as mm, 800 as a from dual union all
select date'2012-02-01' as mm, 1900 as a from dual union all
select date'2012-03-01' as mm, 1750 as a from dual union all
select date'2012-04-01' as mm, -20000 as a from dual union all
select date'2012-05-01' as mm, 900 as a from dual union all
select date'2012-06-01' as mm, 3900 as a from dual union all
select date'2012-07-01' as mm, -2600 as a from dual union all
select date'2012-08-01' as mm, -2600 as a from dual union all
select date'2012-09-01' as mm, 2100 as a from dual union all
select date'2012-10-01' as mm, -2400 as a from dual union all
select date'2012-11-01' as mm, 1100 as a from dual union all
select date'2012-12-01' as mm, 1300 as a from dual
) t;
推荐答案
因此,我们针对此问题释放MODEL
子句(仅能解决其神秘性的设备):
So let's unleash the MODEL
clause (a device whose mystery is only exceeded by its power) on this problem:
with data as (
select date'2012-01-01' as mm, 800 as a from dual union all
select date'2012-02-01' as mm, 1900 as a from dual union all
select date'2012-03-01' as mm, 1750 as a from dual union all
select date'2012-04-01' as mm, -20000 as a from dual union all
select date'2012-05-01' as mm, 900 as a from dual union all
select date'2012-06-01' as mm, 3900 as a from dual union all
select date'2012-07-01' as mm, -2600 as a from dual union all
select date'2012-08-01' as mm, -2600 as a from dual union all
select date'2012-09-01' as mm, 2100 as a from dual union all
select date'2012-10-01' as mm, -2400 as a from dual union all
select date'2012-11-01' as mm, 1100 as a from dual union all
select date'2012-12-01' as mm, 1300 as a from dual
)
select mm, a, b
from (
-- Add a dummy value for b, making it available to the MODEL clause
select mm, a, 0 b
from data
)
-- Generate a ROW_NUMBER() dimension, in order to access rows by RN
model dimension by (row_number() over (order by mm) rn)
-- Spreadsheet values / measures involved in calculations are mm, a, b
measures (mm, a, b)
-- A single rule will do. Any value of B should be calculated according to
-- GREATEST([previous value of B] + [current value of A], 0)
rules (
b[any] = greatest(nvl(b[cv(rn) - 1], 0) + a[cv(rn)], 0)
)
上面的结果:
MM A B
01.01.2012 800 800
01.02.2012 1900 2700
01.03.2012 1750 4450
01.04.2012 -20000 0
01.05.2012 900 900
01.06.2012 3900 4800
01.07.2012 -2600 2200
01.08.2012 -2600 0
01.09.2012 2100 2100
01.10.2012 -2400 0
01.11.2012 1100 1100
01.12.2012 1300 2400
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