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Help with TSQL, getting StartDate and EndDate from WeekDate !!! Expand / Collapse
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Posted Monday, September 24, 2007 8:30 AM
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Hi All,
I have a table called PromoHistory with the following fields,types, and Null/NotNull attributes.

WeekDate (datetime) NOT NULL
OutletId (nvarchar) NOT NULL
ProductId (nvarchar) NOT NULL
Price (decimal) NOT NULL
cost (decimal) NOT NULL
PromotionType (nvarchar) NOT NULL
AdType (nvarchar)
DisplayType (nvarchar)
[X Value] (nvarchar)
[Y Value] (nvarchar)

This table has 721651 records.
Following is an example of records for one of the ProductID in one of the OutletID (Although this table have thousands of Products and hundreds of Outlet)
(please note that records are order by WeekDate asc).
(each coulmn is seperated by comma)

WeekDate, OutletId, ProductId, Price, cost, PromotionType, AdType, DisplayType, [X Value], [Y Value]

2006-10-21, 00370, 000-38000-31841, 3.02, 2.53, Price Promotion, NULL, NULL, 3, 2
2006-10-28, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, 2, 2
2006-11-04, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2006-11-11, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2006-11-25, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2007-03-24, 00370, 000-38000-31841, 2.51, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-03-31, 00370, 000-38000-31841, 2.5, 1.97, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-04-07, 00370, 000-38000-31841, 2.5, 2.39, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-04-14, 00370, 000-38000-31841, 2.5, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-04-21, 00370, 000-38000-31841, 2.5, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-04-28, 00370, 000-38000-31841, 2.5, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-05-05, 00370, 000-38000-31841, 2.51, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-05-12, 00370, 000-38000-31841, 2.53, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL

Now, based on PromoHistory table I want have a SELECT statement excluding WeekDate but want to include the following two columns:

StartDate (datetime)
EndDate (datetime)

That is In my select query I want to get the Startdate, StartDate, Enddate, OutletId, ProductId, Price, cost, PromotionType, AdType, DisplayType, [X Value], [Y Value]


In each set of same OutletId; same ProductId; same Price; same cost; same PromotionType; same AdType; same DisplayType; same [X Value]; and same [Y Value], I want to populate those new columns. I want to populate [Startdate] with the earliest WeekDate in the set and [EndDate] with the largest WeekDate in the set.

So there are two things that must be considerd.

a) It's a same Set (meaning everything is same except Weeklydate)[/b].

And b) the differnce between the WeeklyDate as compare to the previous WeeklyDate in the Set is 7 (be sure they are sort based on WeekDate).As long as those 2 criteria are met there should always be 1 record generated per set in the SELECT statement.

In the above example note the following three records.

WeekDate, OutletId, ProductId, Price, cost, PromotionType, AdType, DisplayType, [X Value], [Y Value]
2006-11-04, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2006-11-11, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2006-11-25, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL

Now lets check the 2 criteria. A)Its a same set; meaning it has same OutletId; same ProductId; same Price; same cost; same PromotionType; same AdType; same DisplayType; same [X Value]; and same [Y Value]. B) For the first two rows only the difference between the Weekdate is 7. So the SELECT statement should return the following 2 records:

StartDate, Enddate, OutletId, ProductId, Price, cost, PromotionType, AdType, DisplayType, [X Value], [Y Value]
2006-11-04, 2006-11-11, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2006-11-25, 2006-12-02, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL

In the 2nd row of the SELECT statement please note that since one of the criteria was not matched then the EndDate will be calculated as follows
Enddate=StartDate+7, so it will be Endate=2006-11-25 + 7, which is 2006-12-02.

Also not that in the SELECT the Enddate and StartDate cannot be same, neither can anyone of them be NULL.

So for the above example the SELECT should return the following results.

StartDate, Enddate, OutletId, ProductId, Price, cost, PromotionType, AdType, DisplayType, [X Value], [Y Value]
2006-10-21, 2006-10-28, 00370, 000-38000-31841, 3.02, 2.53, Price Promotion, NULL, NULL, 3, 2
2006-10-28, 2006-11-04, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, 2, 2
2006-11-04, 2006-11-11, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2006-11-25, 2006-12-02, 00370, 000-38000-31841, 2.99, 2.53, Price Promotion, NULL, NULL, NULL, NULL
2007-03-24, 2007-03-31, 00370, 000-38000-31841, 2.51, 2.53, Price Promotion, SHELF TALKE, IN AISLE, NULL, NULL
2007-03-31, 2007-04-07, 00370, 000-38000-31841, 2.50, 1.97, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-04-07, 2007-04-14, 00370, 000-38000-31841, 2.50, 2.39, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-04-14, 2007-04-28, 00370, 000-38000-31841, 2.50, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-05-05, 2007-05-05, 00370, 000-38000-31841, 2.51, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL
2007-05-12, 2007-05-19, 00370, 000-38000-31841, 2.53, 2.53, Price Promotion, SHELF TALKER, IN AISLE, NULL, NULL

CAN SOME PLEASE HELP....
THANKS A MILLION IN ADVANCE.....

Zee


 

Post #402047
Posted Monday, September 24, 2007 9:32 AM


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Your question is a bit convoluted and so I'm not quite sure what you want from the data.

Querying by week, you could use the datepart() function and use the week number to group rows together by week. Then you could easily use the min date from that week and it should be the startdate according to what I gather from your data. The enddate would be startdate + 7, no need to calculate.

Not sure if this would help, but you might try writing a few queries with that function (need a group by as well) and see if that helps.







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Post #402101
Posted Monday, September 24, 2007 11:12 AM
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Steve,

I am not a SQL expert. Please guide me how I can achieve this. First of all do you fully understand the problem?

I have created a script to create a temperory table & then insert records for this example. You or other people can then test the script against it.

Here is the CREATE table & Insert script for you.

--Start of Script
Create table #PromoHistory
(
WeekDate datetime NOT NULL, OutletId nvarchar(50) NOT NULL, ProductId nvarchar(50) NOT NULL,Price decimal(18,2) NOT NULL,Cost decimal(18,2) NOT NULL,PromotionType nvarchar(50) NOT NULL,
AdType nvarchar(50),DisplayType nvarchar(50),[X Value] nvarchar(50),[Y Value] nvarchar(50))
GO

INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2006-10-21','00370','000-38000-31841',3.02,2.53,'Price Promotion',NULL,NULL,'3','2')
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2006-10-28','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,2,2)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2006-11-04','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2006-11-11','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2006-11-25','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-03-24','00370','000-38000-31841',2.51,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-03-31','00370','000-38000-31841',2.50,1.97,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-04-07','00370','000-38000-31841',2.50,2.39,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-04-14','00370','000-38000-31841',2.50,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-04-21','00370','000-38000-31841',2.50,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-04-28','00370','000-38000-31841',2.50,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-05-05','00370','000-38000-31841',2.51,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES   ('2007-05-12','00370','000-38000-31841',2.53,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
--End of Script

 

For this example the script that I am looking for should return the result that I have posted earlier.

 

Can you please help?

 

Desperatley waiting for help.

 

Zee

 

Post #402153
Posted Monday, September 24, 2007 1:42 PM


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This should give you correct results, but won't be the fastest thing on the planet on your large dataset. 

Indexing could help quite a bit, and/or a computed column with an index on the computation.  In particular, a outletid+productid+weekdate composite index.

--use a second table to identify where the breaks > 7 days are

create table #ptemp (WeekDate datetime NOT NULL, OutletId nvarchar(50) NOT NULL, ProductId nvarchar(50) NOT NULL)

insert #ptemp (outletid,productID,weekdate)

select p.outletid,p.productID,p.weekdate

from #PromoHistory p left outer join #PromoHistory p2

on p.outletid=p2.outletID and p.productID=p2.productid and p2.weekdate=dateadd(dd,-7,p.weekdate)

where p2.weekdate is null

--add an index to help performance some

create index ptmp on #ptemp(outletid,productid)

--get the data

select ranktmp,min(WeekDate) startdate , max(dateadd(dd,7,weekdate)) endweek, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value]

from (select ph.*, count(pt.weekdate) ranktmp from #promohistory ph inner join #ptemp pt on ph.OutletId=pt.outletid and ph.ProductId=pt.productid

where pt.weekdate<=ph.weekdate

group by

ph.WeekDate, ph.OutletId, ph.ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value]

) ptmp

group by OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value], ranktmp

order by outletid, productid,ranktmp, min(WeekDate),max(weekdate)

--clean up and remove secondary table

drop table #ptemp



----------------------------------------------------------------------------------
Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?
Post #402217
Posted Tuesday, September 25, 2007 3:10 PM
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This is how I was able to do that :).


set nocount on

Create table #PromoHistory
(
WeekDate datetime NOT NULL, OutletId nvarchar(50) NOT NULL, ProductId nvarchar(50) NOT NULL,Price decimal(18,2) NOT NULL,Cost decimal(18,2) NOT NULL,PromotionType nvarchar(50) NOT NULL,
AdType nvarchar(50),DisplayType nvarchar(50),[X Value] nvarchar(50),[Y Value] nvarchar(50))
GO

INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2006-10-21','00370','000-38000-31841',3.02,2.53,'Price Promotion',NULL,NULL,'3','2')
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2006-10-28','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,2,2)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2006-11-04','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2006-11-11','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2006-11-18','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2006-11-25','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-03-24','00370','000-38000-31841',2.51,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-03-31','00370','000-38000-31841',2.50,1.97,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-04-07','00370','000-38000-31841',2.50,2.39,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-04-14','00370','000-38000-31841',2.50,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-04-21','00370','000-38000-31841',2.50,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-04-28','00370','000-38000-31841',2.50,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-05-05','00370','000-38000-31841',2.51,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-05-12','00370','000-38000-31841',2.53,2.53,'Price Promotion','SHELF TALKER','IN AISLE',NULL,NULL)
GO
INSERT INTO #PromoHistory(WeekDate, OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value])
VALUES ('2007-05-19','00370','000-38000-31841',2.99,2.53,'Price Promotion',NULL,NULL,NULL,NULL)
GO

selectSequenceStarts.OutletID,
SequenceStarts.ProductID,
SequenceStarts.Price,
SequenceStarts.Cost,
SequenceStarts.PromotionType,
SequenceStarts.AdType,
SequenceStarts.DisplayType,
SequenceStarts.[X Value],
SequenceStarts.[Y Value],
SequenceStarts.WeekDate as StartDate,
case when min(SequenceEnds.WeekDate) = SequenceStarts.WeekDate then dateadd(week, 1, SequenceStarts.WeekDate) else min(SequenceEnds.WeekDate) end as EndDate
from--SequenceStarts
(selectA.OutletId,
A.ProductId,
A.Price,
A.Cost,
A.PromotionType,
Coalesce(A.AdType, '') as AdType,
Coalesce(A.DisplayType, '') as DisplayType,
Coalesce(A.[X Value], '') as [X Value],
Coalesce(A.[Y Value], '') as [Y Value],
A.WeekDate
from#PromoHistory A
left outer join #PromoHistory B
on A.OutletID = B.OutletID
and A.ProductID = B.ProductID
and A.Price = B.Price
and A.Cost = b.Cost
and A.PromotionType = B.PromotionType
and Coalesce(A.AdType, '') = Coalesce(B.AdType, '')
and Coalesce(A.DisplayType, '') = Coalesce(B.DisplayType, '')
and Coalesce(A.[X Value], '') = Coalesce(B.[X value], '')
and Coalesce(A.[Y Value], '') = Coalesce(B.[Y value], '')
and A.WeekDate = dateadd(Week, 1, B.WeekDate)
whereB.OutletID is null) SequenceStarts
inner join --SequenceEnds
(selectA.OutletId,
A.ProductId,
A.Price,
A.Cost,
A.PromotionType,
Coalesce(A.AdType, '') as AdType,
Coalesce(A.DisplayType, '') as DisplayType,
Coalesce(A.[X Value], '') as [X Value],
Coalesce(A.[Y Value], '') as [Y Value],
A.WeekDate
from#PromoHistory A
left outer join #PromoHistory B
on A.OutletID = B.OutletID
and A.ProductID = B.ProductID
and A.Price = B.Price
and A.Cost = b.Cost
and A.PromotionType = B.PromotionType
and Coalesce(A.AdType, '') = Coalesce(B.AdType, '')
and Coalesce(A.DisplayType, '') = Coalesce(B.DisplayType, '')
and Coalesce(A.[X Value], '') = Coalesce(B.[X value], '')
and Coalesce(A.[Y Value], '') = Coalesce(B.[Y value], '')
and A.WeekDate = dateadd(Week, -1, B.WeekDate)
whereB.OutletID is null) SequenceEnds
on SequenceStarts.OutletID = SequenceEnds.OutletID
and SequenceStarts.ProductID = SequenceEnds.ProductID
and SequenceStarts.Price = SequenceEnds.Price
and SequenceStarts.Cost = SequenceEnds.Cost
and SequenceStarts.PromotionType = SequenceEnds.PromotionType
and SequenceStarts.AdType = SequenceEnds.AdType
and SequenceStarts.DisplayType = SequenceEnds.DisplayType
and SequenceStarts.[X Value] = SequenceEnds.[X Value]
and SequenceStarts.[Y Value] = SequenceEnds.[Y Value]
whereSequenceStarts.WeekDate <= SequenceEnds.WeekDate
group by SequenceStarts.OutletID,
SequenceStarts.ProductID,
SequenceStarts.Price,
SequenceStarts.Cost,
SequenceStarts.PromotionType,
SequenceStarts.AdType,
SequenceStarts.DisplayType,
SequenceStarts.[X Value],
SequenceStarts.[Y Value],
SequenceStarts.WeekDate
order by SequenceStarts.WeekDate

drop table #PromoHistory

Post #402762
Posted Tuesday, September 25, 2007 4:36 PM
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I think this does what you want.
select
DateAdd( dd, 1 - DatePart(dw, WeekDate), WeekDate ) as StartDate,
DateAdd( dd, 7 - DatePart(dw, WeekDate), WeekDate ) as EndDate,
OutletId, ProductId, Price, Cost,PromotionType,AdType,DisplayType,[X Value],[Y Value]
from #PromoHistory;

The sample data you gave had all entries in a different week. If, however, you have two or more entries within the same week, this would generate duplicate rows in the result set if all the other info in the row was the same. To remove those, use SELECT DISTINCT instead of just SELECT.


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Post #402773
Posted Tuesday, September 25, 2007 8:56 PM


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Zee,


Couple of questions... trying to help a bit, if needed...


First, how long does it take your final code (thank you for posting it) to run on all of those rows? In the absense of any other info, it looks to me like it's gonna do 4 full table scans.


Second, you never said what the first day of a week was (or, at least I missed that part)...

Third, why do you think there's only 7 days between 11/04 and 11/11... there's actually 8 because you must count 11/04 as the first day...

11/04 = 1
11/05 = 2
11/06 = 3
11/07 = 4
11/08 = 5
11/09 = 6
11/10 = 7
11/11 = 8


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Post #402819
Posted Wednesday, September 26, 2007 4:57 AM


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And you got a LOT of help here!!!

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=89705




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Post #402932
Posted Wednesday, September 26, 2007 6:32 AM


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Zee,
The reason I asked the questions is because the solution you're so happy with (thank you for posting it) does 4 table scans... if the right indexes are present, it will still do at least 2 table scans. It'll work a lot better if you can get some code that groups things by week instead of 7 days. Tom Carr's code will beat the tar out of the code you posted.


--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

"Change is inevitable. Change for the better is not." -- 04 August 2013
(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

Helpful Links:
How to post code problems
How to post performance problems
Post #402976
Posted Wednesday, September 26, 2007 7:31 AM


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Wait a minute? What is the objective here?

1) Same week (sun-sat or mon-sun)
2) Any "7-day period" starting with first non-sequential date?



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Post #403011
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