sql - 如何在 Oracle SQL 中的键中的特定值之后向行添加标志?
问题描述
我有以下数据:
Key Stage CreateDate
AAF 0 01-Jan-2018
AAF 0 02-Jan-2018
AAF 0 10-Jan-2018
AAF 20 20-Jan-2018
AAF 40 20-Mar-2018
AAF 0 01-May-2018
AAF 0 10-May-2018
AAF 0 20-May-2018
AAF 30 20-Jun-2018
AAF 0 20-Jul-2018
AAF 100 20-Jul-2018
我基本上是在尝试计算每个阶段花费的天数。我目前正在每个阶段内取最短日期,并找到下一阶段的最短日期之间的差异:
select
key,
stage,
cast(extract (day from max(next_dt) - min(createddate)) as number) as interval_days
from
(
select
key,
stage,
createddate
lead(createddate,1) over (partition by key order by createddate) next_dt
from oppstages
)
group by key,stage
可以看出,有时,阶段从 0-40 进展,但又回到 0。所以上述逻辑不能正常工作,我认为有必要将 0-40 归为一个类别,以及任何在 40 之后作为下一个类别,依此类推(如果阶段减少并以新的较小阶段编号重新开始)。以下查询为我提供了概率下降的点,但我无法标记以进一步对行进行分组。
select key,
stage,
createddate,
next_dt,
next_prob,
case when next_prob < stage then 1 else 0 end as valid_flag,
from
(
select
key,
stage,
createddate,
lead(createddate,1) over (partition by key order by createddate) next_dt,
coalesce(lead(stage,1) over (partition by key order by createddate),101) next_prob,
from oppstages
) a
我期望这个输出,以便我可以使用标志分组来计算每个实例花费的天数:
Key Stage CreateDate Flag
AAF 0 01-Jan-2018 1
AAF 0 02-Jan-2018 1
AAF 0 10-Jan-2018 1
AAF 20 20-Jan-2018 1
AAF 40 20-Mar-2018 1
AAF 0 01-May-2018 2
AAF 0 10-May-2018 2
AAF 0 20-May-2018 2
AAF 30 20-Jun-2018 2
AAF 10 20-Jul-2018 3
AAF 100 20-Jul-2018 3
谢谢。
解决方案
您可以尝试使用lag
窗口函数获取Stage
先前的值。
然后使用CASE WHEN
check PREVAL > STAGE
do increase 1
。
CREATE TABLE T(
Key varchar(50),
Stage int,
CreateDate date
);
INSERT INTO T VALUES ('AAF',0,TO_DATE('01-01-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',0,TO_DATE('02-01-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',0,TO_DATE('10-01-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',20,TO_DATE('20-01-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',40,TO_DATE('20-03-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',0,TO_DATE('01-05-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',0,TO_DATE('10-05-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',0,TO_DATE('20-05-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',30,TO_DATE('20-06-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',10,TO_DATE('20-07-2018','dd-mm-yyyy'));
INSERT INTO T VALUES ('AAF',100,TO_DATE('20-07-2018','dd-mm-yyyy'));
查询 1:
SELECT t1.KEY,
t1.STAGE,
(SUM(CASE WHEN PREVAL > STAGE THEN 1 ELSE 0 END) over (partition by Key order by CreateDate) + 1) Flag
FROM (
SELECT T.*,lag(Stage) over (partition by Key order by CreateDate) preVAL
FROM T
)t1
结果:
| KEY | STAGE | FLAG |
|-----|-------|------|
| AAF | 0 | 1 |
| AAF | 0 | 1 |
| AAF | 0 | 1 |
| AAF | 20 | 1 |
| AAF | 40 | 1 |
| AAF | 0 | 2 |
| AAF | 0 | 2 |
| AAF | 0 | 2 |
| AAF | 30 | 2 |
| AAF | 10 | 3 |
| AAF | 100 | 3 |
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