作为一名C#开发人员,在尝试创建基于T-SQL的纯解决方案时遇到一系列日期范围的日常/月份问题时,我正在摸不着头脑。
我有一组数据看起来像这样:
UserID Department StartDate EndDate
====== ========== ========== ==========
1 A 2011-01-02 2011-01-05
1 A 2011-01-20 2011-01-25
1 A 2011-02-25 2011-03-05
1 B 2011-01-21 2011-01-22
2 A 2011-01-01 2011-01-20
3 C 2011-01-01 2011-02-03
日期范围不重叠,可能跨越几个月,特定用户和部门可能在一个月内存在多个范围。 我想要做的是总结每个用户,部门,年和月的天数(包括),像这样(在我的例子中保留任何数学错误......):
UserID Department Year Month Days
====== ========== ==== ===== ====
1 A 2011 01 10
1 A 2011 02 4
1 A 2011 03 5
1 B 2011 01 2
2 A 2011 01 20
3 C 2011 01 31
3 C 2011 02 3
此数据将进入报告工具使用的新表格。 我希望问题描述足够清楚,这是我在这里的第一篇帖子,温柔: - )
提前致谢!
答案 0 :(得分:8)
工作样本
-- sample data in a temp table
declare @t table (UserID int, Department char(1), StartDate datetime, EndDate datetime)
insert @t select
1 ,'A', '2011-01-02','2011-01-05'union all select
1 ,'A', '2011-01-20','2011-01-25'union all select
1 ,'A', '2011-02-25','2011-03-05'union all select
1 ,'B', '2011-01-21','2011-01-22'union all select
2 ,'A', '2011-01-01','2011-01-20'union all select
3 ,'C', '2011-01-01','2011-02-03'
-- the query you need is below this line
select UserID, Department,
YEAR(StartDate+v.number) Year,
MONTH(StartDate+v.number) Month, COUNT(*) Days
from @t t
inner join master..spt_values v
on v.type='P' and v.number <= DATEDIFF(d, startdate, enddate)
group by UserID, Department, YEAR(StartDate+v.number), MONTH(StartDate+v.number)
order by UserID, Department, Year, Month