与T-SQL环路(它从标签表中读取数据,并插入到tab_result):
create table tab
(dt date, id int);
insert into tab values(DATEADD(day,-12,GETDATE()),1);
insert into tab values(DATEADD(day,-10,GETDATE()),1);
insert into tab values(DATEADD(day,-9,GETDATE()),1);
insert into tab values(DATEADD(day,-8,GETDATE()),1);
insert into tab values(DATEADD(day,-7,GETDATE()),3);
insert into tab values(DATEADD(day,-6,GETDATE()),3);
insert into tab values(DATEADD(day,-5,GETDATE()),1);
insert into tab values(DATEADD(day,-4,GETDATE()),1);
insert into tab values(DATEADD(day,-3,GETDATE()),1);
create table tab_result
(dt date, id int, age int);
DECLARE @id INT, @dt date, @prevId INT=NULL, @prevDt date=NULL, @age int
DECLARE CurName CURSOR FAST_FORWARD READ_ONLY
FOR
SELECT id,dt
FROM tab
ORDER BY id,dt
OPEN CurName
FETCH NEXT FROM CurName INTO @id, @dt
set @age=0;
WHILE @@FETCH_STATUS = 0
BEGIN
if (@prevId<>@id or @prevDt <> DATEADD(day,-1, @dt))
set @age=1;
else
set @[email protected]+1;
insert into tab_result values (@dt, @id, @age)
set @[email protected]
set @[email protected]
FETCH NEXT FROM CurName INTO @id, @dt
END
CLOSE CurName
DEALLOCATE CurName
select * from tab_result order by id, dt;
与普通的SQL它会像下面(ID在本例中是你的钥匙):
create table tab
(dt date, id int);
insert into tab values(DATEADD(day,-12,GETDATE()),1);
insert into tab values(DATEADD(day,-10,GETDATE()),1);
insert into tab values(DATEADD(day,-9,GETDATE()),1);
insert into tab values(DATEADD(day,-8,GETDATE()),1);
insert into tab values(DATEADD(day,-7,GETDATE()),3);
insert into tab values(DATEADD(day,-6,GETDATE()),3);
insert into tab values(DATEADD(day,-5,GETDATE()),1);
insert into tab values(DATEADD(day,-4,GETDATE()),1);
insert into tab values(DATEADD(day,-3,GETDATE()),1);
with x as (
select tab.dt,
tab.id,
case when prev.dt is not null then 1 else 0 end as exists_on_prev_day
from
tab left outer join tab prev on (tab.id=prev.id and DATEADD(day,-1 , tab.dt)= prev.dt)
)
select id,dt,
(select
-- count all records with the same id and date less or equal date of the given record
count(*) from x x2 where x2.id=x.id and x2.dt<=x.dt
-- (tricky part) we want to count only records between current record and last record without "previous" record (that is with exists_on_prev_day flag = 0)
and not exists (select 1 from x x3 where x3.id=x2.id and x3.dt>x2.dt and x3.dt<=x.dt and x3.exists_on_prev_day=0)) age
from x
order by id, dt;
结果:
id dt age
1 1 19.11.2016 00:00:00 1
2 1 21.11.2016 00:00:00 1
3 1 22.11.2016 00:00:00 2
4 1 23.11.2016 00:00:00 3
5 1 26.11.2016 00:00:00 1
6 1 27.11.2016 00:00:00 2
7 1 28.11.2016 00:00:00 3
8 3 24.11.2016 00:00:00 1
9 3 25.11.2016 00:00:00 2
11/3 KeyExists是什么意思? –
你的问题不清楚,明确地解释逻辑 – sumit
这不是一个真正不清楚的问题......这是工作日间的孤岛和空白问题。我想你可以这样做的一种方法是用一个函数从表格中获取最小/最大日期,找出这些日期之间的所有工作日(不是周末或公共假期,但是你需要一张充满公开的表格假期日期为此),然后将其加入原始表并进行比较。 – ZLK