[英]count(distinct) over (partition by… doesn't work in Oracle SQL
我想计算过去30天的distinct
day_number
。 但是,不同的功能不能与over
一起使用
如果我删除distinct
,它会给我day_number
的总数,但是day_number
可以有很多重复。 所以这就是为什么我要添加distinct
。
select tr.*,
count( distinct day_number) OVER (PARTITION BY ACCOUNT ORDER BY DAY_number range 29 PRECEDING) as result
from table tr;
任何人都可以告诉我如何计算over(partition by..)
语句中的不同数字? 提前致谢。
您可以通过首先创建一个列,该列仅列出每个id一次,然后对该列执行范围计数,例如:
WITH sd AS (SELECT 1 ID, 10 val FROM dual UNION ALL
SELECT 1 ID, 20 val FROM dual UNION ALL
SELECT 2 ID, 30 val FROM dual UNION ALL
SELECT 2 ID, 40 val FROM dual UNION ALL
SELECT 4 ID, 50 val FROM dual UNION ALL
SELECT 4 ID, 60 val FROM dual UNION ALL
SELECT 6 ID, 70 val FROM dual)
SELECT ID,
val,
COUNT(id_distinct) OVER (ORDER BY ID RANGE 3 PRECEDING) cnt_disinct_ids
FROM (SELECT ID,
val,
CASE WHEN row_number() OVER (PARTITION BY ID ORDER BY val) = 1 THEN ID END id_distinct
FROM sd);
ID VAL CNT_DISINCT_IDS
---------- ---------- ---------------
1 10 1
1 20 1
2 30 2
2 40 2
4 50 3
4 60 3
6 70 2
ETA:证明上述技术适用于您的数据:
WITH your_table AS (SELECT 'ABCDE' account_sk, 23 day_sk FROM dual UNION ALL
SELECT 'ABCDE' account_sk, 23 day_sk FROM dual UNION ALL
SELECT 'ABCDE' account_sk, 24 day_sk FROM dual UNION ALL
SELECT 'ABCDE' account_sk, 25 day_sk FROM dual UNION ALL
SELECT 'ABCDE' account_sk, 53 day_sk FROM dual UNION ALL
SELECT 'ABCDE' account_sk, 53 day_sk FROM dual UNION ALL
SELECT 'ABCDE' account_sk, 55 day_sk FROM dual UNION ALL
SELECT 'VWXYZ' account_sk, 10 day_sk FROM dual UNION ALL
SELECT 'VWXYZ' account_sk, 12 day_sk FROM dual UNION ALL
SELECT 'VWXYZ' account_sk, 40 day_sk FROM dual UNION ALL
SELECT 'VWXYZ' account_sk, 40 day_sk FROM dual)
SELECT account_sk,
day_sk,
COUNT(day_sk_distinct) OVER (PARTITION BY account_sk ORDER BY day_sk RANGE BETWEEN 29 PRECEDING AND CURRENT ROW) count_distinct_day_sk
FROM (SELECT account_sk,
day_sk,
CASE WHEN row_number() OVER (PARTITION BY account_sk, day_sk ORDER BY day_sk) = 1 THEN day_sk END day_sk_distinct
FROM your_table);
ACCOUNT_SK DAY_SK COUNT_DISTINCT_DAY_SK
---------- ---------- ---------------------
ABCDE 23 1
ABCDE 23 1
ABCDE 24 2
ABCDE 25 3
ABCDE 53 3
ABCDE 53 3
ABCDE 55 2
VWXYZ 10 1
VWXYZ 12 2
VWXYZ 40 2
VWXYZ 40 2
count(distinct ...)
适用于over子句,主要问题是order by。 你不能count (distinct ..) over (partition by ... order by ...)
因为DISTINCT函数和RATIO_TO_REPORT不能有ORDER BY。 所以我这样做了:
select tr.*, count (distinct day_number) over (partition by account)
from (select t.*, row_number() over (partition by account order by day_number) row_number from table t) tr
where row_number < 30;
我已经在HR的员工计划中测试了它(你可以在任何地方找到免费oracle方案)我不确定它会在你的架构中有效,因为我没有它的副本,但是,如果没有,它应该给你一些思路:
select count (distinct manager_id) over (partition by department_id), department_id, manager_id
from (select e.*, row_number() over (partition by department_id order by employee_id) row_number from employees e)
where row_number < 30;
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