[英]Filling in missing dates DB2 SQL
My initial query looks like this: 我的初始查询如下:
select process_date, count(*) batchCount
from T1.log_comments
order by process_date asc;
I need to be able to do some quick analysis for weekends that are missing, but wanted to know if there was a quick way to fill in the missing dates not present in process_date
. 我需要对缺少的周末进行一些快速分析,但想知道是否有一种快速的方法来填写
process_date
不存在的缺失日期。
I've seen the solution here but am curious if there's any magic hidden in db2 that could do this with only a minor modification to my original query. 我在这里看到了解决方案,但很好奇,如果db2中隐藏了任何魔术,只需对我的原始查询进行较小的修改就可以做到这一点。
Note: Not tested, framed it based on my exposure to SQL Server/Oracle. 注意:未经测试,请根据我对SQL Server / Oracle的了解进行构图。 I guess this gives you the idea though: *now amended and tested on DB2*
我想这给了您一个主意: *现在已在DB2上进行了修改和测试*
WITH MaxDateQry(MaxDate) AS
(
SELECT MAX(process_date) FROM T1.log_comments
),
MinDateQry(MinDate) AS
(
SELECT MIN(process_date) FROM T1.log_comments
),
DatesData(ProcessDate) AS
(
SELECT MinDate from MinDateQry
UNION ALL
SELECT (ProcessDate + 1 DAY) FROM DatesData WHERE ProcessDate < (SELECT MaxDate FROM MaxDateQry)
)
SELECT a.ProcessDate, b.batchCount
FROM DatesData a LEFT JOIN
(
SELECT process_date, COUNT(*) batchCount
FROM T1.log_comments
) b
ON a.ProcessDate = b.process_date
ORDER BY a.ProcessDate ASC;
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