Hi,
I have a tricky SQL query problem that I'm having probs with.
I have a table which resembles something like this
Date | Price1 | Price2 | Price3
01 Jan 2006 | 100 | 100 | 100
02 Jan 2006 | 100 | 100 | 100
03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 115 | 100 | 100
05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 100 | 100 | 100
09 Jan 2006 | 100 | 100 | 100
and I want to write a query/view that will return this
>From | To | Price1 | Price2 | Price3
01 Jan 2006 | 03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 09 Jan 2006 | 100 | 100 | 100
Any ideas?
I know how to write a routine that would do the same in VB but I am
looking to do a lot of the same calculation/query so I need it to be
fast (which VB wouldnt be)
TIA
Eddie 15  5962 
The reason you are having trouble is that your data is not normalized.
Also your data is based on change over time and not on groupings, so to
accomplish this in T-SQL you'll probably have to use CURSORS which is
going to be just as complicated (if not more complicated) than doing it
in VB, so my suggestion is to normalise the database. If this is not
possible then rather stick to doing it in VB
It's a pretty simple query (much easier than doing it in VB):
SELECT MIN(Date) as From, MAX(Date) as To,
Price1, Price2, Price3
FROM TheTable
GROUP BY Price1, Price2, Price3
Razvan ed************* @gmail.com wrote:
Hi,
I have a tricky SQL query problem that I'm having probs with.
I have a table which resembles something like this
Date | Price1 | Price2 | Price3
01 Jan 2006 | 100 | 100 | 100
02 Jan 2006 | 100 | 100 | 100
03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 115 | 100 | 100
05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 100 | 100 | 100
09 Jan 2006 | 100 | 100 | 100
and I want to write a query/view that will return this
From | To | Price1 | Price2 | Price3
01 Jan 2006 | 03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 09 Jan 2006 | 100 | 100 | 100
Any ideas?
I know how to write a routine that would do the same in VB but I am
looking to do a lot of the same calculation/query so I need it to be
fast (which VB wouldnt be)
TIA
Eddie
Hi Razvan,
Thanks, but this wont work.
One of the responses will be
01 Jan 2006 | 09 Jan 2006 | 100 | 100 | 100
Ed
Razvan Socol wrote:
It's a pretty simple query (much easier than doing it in VB):
SELECT MIN(Date) as From, MAX(Date) as To,
Price1, Price2, Price3
FROM TheTable
GROUP BY Price1, Price2, Price3
Razvan
ed************* @gmail.com wrote:
Hi,
I have a tricky SQL query problem that I'm having probs with.
I have a table which resembles something like this
Date | Price1 | Price2 | Price3
01 Jan 2006 | 100 | 100 | 100
02 Jan 2006 | 100 | 100 | 100
03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 115 | 100 | 100
05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 100 | 100 | 100
09 Jan 2006 | 100 | 100 | 100
and I want to write a query/view that will return this
>From | To | Price1 | Price2 | Price3
01 Jan 2006 | 03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 09 Jan 2006 | 100 | 100 | 100
Any ideas?
I know how to write a routine that would do the same in VB but I am
looking to do a lot of the same calculation/query so I need it to be
fast (which VB wouldnt be)
TIA
Eddie
lo***********@h otmail.com wrote:
The reason you are having trouble is that your data is not normalized.
I'm intrigued. How would you normalise the data further - the date is a
unqiue field and their would be no benefit in storing the prices in a
separate table
I'm intrigued. How would you normalise the data further - the date is a
unqiue field and their would be no benefit in storing the prices in a
separate table
Well, remember that all non-key fields needs to be dependant on the
primary key and only on the primary key. Date seems to be an attribute
of an Order (correct me if I'm wrong) and Price seems to be an
attribute of a product, so price would need to be in a products table
and Date would need to be in an orders table. The fact that you have a
lot of repeating groups, e.g. 100|100|100 shows that the data isn't
properly normalised. This is not something I can teach you in one
e-mail, so please have a look at the following link: http://www.utexas.edu/its/windows/da...ing/index.html
Try this
create table #mytable(dt datetime,Price1 int, Price2 int, Price3 int)
insert into #mytable(dt,Pri ce1,Price2,Pric e3)
select '01 Jan 2006',100,100,1 00 union all
select '02 Jan 2006',100,100,1 00 union all
select '03 Jan 2006',100,100,1 00 union all
select '04 Jan 2006',115,100,1 00 union all
select '05 Jan 2006',115,100,1 00 union all
select '06 Jan 2006',115,115,1 15 union all
select '07 Jan 2006',115,100,1 00 union all
select '08 Jan 2006',100,100,1 00 union all
select '09 Jan 2006',100,100,1 00
select min(dt) as [From],
max(dt) as [To],
Price1,
Price2,
Price3
from (
select a.dt,
a.Price1,
a.Price2,
a.Price3,
a.dt-(select count(*)
from #mytable b
where b.Price1=a.Pric e1
and b.Price2=a.Pric e2
and b.Price3=a.Pric e3
and b.dt <= a.dt) as Num
from #mytable a
) X
group by Price1,Price2,P rice3,Num
order by 1
One method:
CREATE TABLE dbo.TestTable
(
MyDate datetime
CONSTRAINT PK_TestTable PRIMARY KEY,
price1 int NOT NULL,
price2 int NOT NULL,
price3 int NOT NULL
)
INSERT INTO dbo.TestTable
SELECT '20060101', 100, 100, 100
UNION ALL SELECT '20060102', 100, 100, 100
UNION ALL SELECT '20060103', 100, 100, 100
UNION ALL SELECT '20060104', 115, 100, 100
UNION ALL SELECT '20060105', 115, 100, 100
UNION ALL SELECT '20060106', 115, 115, 115
UNION ALL SELECT '20060107', 115, 100, 100
UNION ALL SELECT '20060108', 100, 100, 100
UNION ALL SELECT '20060109', 100, 100, 100
GO
SELECT
FromDates.MyDat e AS FromDate,
COALESCE(ToDate s.MyDate, FromDates.MyDat e) AS ToDate,
FromDates.Price 1,
FromDates.Price 2,
FromDates.Price 3
FROM dbo.TestTable AS FromDates
LEFT JOIN dbo.TestTable AS ToDates ON
FromDates.MyDat e = (
SELECT MIN(MyDate)
FROM dbo.TestTable AS b
WHERE
b.MyDate FromDates.MyDat e AND
b.Price1 = FromDates.Price 1 AND
b.Price2 = FromDates.Price 2 AND
b.Price3 = FromDates.Price 3
)
WHERE
NOT EXISTS(
SELECT *
FROM dbo.TestTable AS b
WHERE
b.MyDate = FromDates.MyDat e - 1 AND
b.Price1 = FromDates.Price 1 AND
b.Price2 = FromDates.Price 2 AND
b.Price3 = FromDates.Price 3
)
ORDER BY
FromDates.MyDat e
--
Hope this helps.
Dan Guzman
SQL Server MVP
<ed************ *@gmail.comwrot e in message
news:11******** *************@h 48g2000cwc.goog legroups.com...
Hi,
I have a tricky SQL query problem that I'm having probs with.
I have a table which resembles something like this
Date | Price1 | Price2 | Price3
01 Jan 2006 | 100 | 100 | 100
02 Jan 2006 | 100 | 100 | 100
03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 115 | 100 | 100
05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 100 | 100 | 100
09 Jan 2006 | 100 | 100 | 100
and I want to write a query/view that will return this
>>From | To | Price1 | Price2 | Price3
01 Jan 2006 | 03 Jan 2006 | 100 | 100 | 100
04 Jan 2006 | 05 Jan 2006 | 115 | 100 | 100
06 Jan 2006 | 06 Jan 2006 | 115 | 115 | 115
07 Jan 2006 | 07 Jan 2006 | 115 | 100 | 100
08 Jan 2006 | 09 Jan 2006 | 100 | 100 | 100
Any ideas?
I know how to write a routine that would do the same in VB but I am
looking to do a lot of the same calculation/query so I need it to be
fast (which VB wouldnt be)
TIA
Eddie
Mark,
Neat query - to quote Wayne's World, "I am not worthy!"
Thanks for taking the time.
Ed :)
Mark,
Neat query - to quote Wayne's World, "I am not worthy!"
Thanks for taking the time.
Ed :)
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