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Hi
Below query is taking 10 seconds to return 90 rows.
Using cte to get the dates of the last 90 days, then summing the production for each day (Alloocated is production qty) and DateCreated is a DateTime value that the units were produced.
So the output is the date of the last 90 days, and the total production for each day
Can anyone point out what I am doing wrong?
;WITH Dates AS
(
SELECT GETDATE()as DateValue
UNION ALL
SELECT DateValue -1
FROM Dates
WHERE DateValue -1 >= dateadd(d,-90,GETDATE())
)
SELECT convert(nvarchar(10),DateValue,121) as ProdDate , coalesce(trk.Tot,0)as ProdQty
FROM Dates D
left join (select convert(nvarchar(10),DateCreated,121) as TrkDate ,SUM(allocated) as Tot from vektronix.[dbo].[Tracking] t
where [TrackingTypeId] = '5'
group by convert(nvarchar(10),DateCreated,121))
as trk on trk.TrkDate = convert(nvarchar(10),DateValue,121)
group by DateValue, trk.Tot
order by datevalue desc
OPTION (MAXRECURSION 32747)
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I don't think you can blame the CTE, I would look into all the convert dates, are you storing your dates as strings in vektronix?
Try changing all the string joins to date joins (eliminating the time component).
Try creating a temp table with the 90 dates instead of the CTE if that makes no difference. I use CTEs only as a last resort and this does not require one.
Never underestimate the power of human stupidity
RAH
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Hi Mycroft.
The dates are stored as dates in the database. How can I do the joins eliminating the time component because that is the reason I did all that converting to nvarchar(10) was to eliminate the time part of the dates
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If you are using 2008 then cast/convert to DATE instead of DATETIME
DECLARE
@D DATETIME
SET @D = GETDATE()
SELECT @D
SELECT CONVERT(DATE,@D)
Never underestimate the power of human stupidity
RAH
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Thanks Mycroft = a bit faster but still slow for a mere 90 rows.
Bellow returns 10000 rows in under as second - so the problem must be in the second part
;WITH Dates AS
(
SELECT GETDATE()as DateValue
UNION ALL
SELECT DateValue -1
FROM Dates
WHERE DateValue -1 >= dateadd(d,-10000,GETDATE())
)
select convert(date,DateValue) from Dates
OPTION (MAXRECURSION 32747)
This executes in under a second (This is basically the output I want, but I also want days where there was zero production hence the CTE)
select convert(date,DateCreated) as TrkDate ,SUM(allocated) as Tot from vektronix.[dbo].[Tracking] t
where [TrackingTypeId] = '5'
group by convert(date,DateCreated)
With the change to date as opposed to a datestring nvarchar(10) as you suggested, below has reduced from about 17 second to 5 seconds. But to be that seems terribly slow for 90 rows?
;WITH Dates AS
(
SELECT GETDATE()as DateValue
UNION ALL
SELECT DateValue -1
FROM Dates
WHERE DateValue -1 >= dateadd(d,-90,GETDATE())
)
SELECT convert(date,DateValue) as ProdDate , coalesce(trk.Tot,0)as ProdQty
FROM Dates D
left join (select convert(date,DateCreated) as TrkDate ,SUM(allocated) as Tot from vektronix.[dbo].[Tracking] t
where [TrackingTypeId] = '5'
group by convert(date,DateCreated))
as trk on trk.TrkDate = convert(date,DateValue)
group by DateValue, trk.Tot
order by datevalue desc
OPTION (MAXRECURSION 32747)
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As the dateconversion seems to be the problem probably together with a bad plan I'd recommend that you minimize the number of conversions:
WITH Datetimes AS
(
SELECT GETDATE()as DateValue
UNION ALL
SELECT DateValue -1
FROM Datetimes
WHERE DateValue -1 >= dateadd(d,-90,GETDATE())
)
,dates AS
(
SELECT DISTINCT convert(date,datevalue) AS ProdDate
FROM Datetimes
)
,trk AS
(
SELECT convert(date,DateCreated) as TrkDate
,allocated
from vektronix.[dbo].[Tracking] t
where [TrackingTypeId] = '5'
)
,trkgrouped as
(
SELECT trkdate
,SUM(allocated) as Tot
FROM trk
GROUP BY trkdate
)
SELECT ProdDate
,coalesce(Tot,0)as ProdQty
FROM Dates D
left JOIN trkgrouped trk on trk.TrkDate = d.ProdDate
order by ProdDate desc
OPTION (MAXRECURSION 32747)The purpose of the DISTINCT is to force the DatesCTE to be materialized.
But if you really want to boost the performance of the query you need to add convert(date,DateCreated) to vektronix.[dbo].[Tracking] as a calculated column and put an index on it.
The reasonable man adapts himself to the world; the unreasonable man adapts the world to himself.
Therefore all progress depends on the unreasonable man.
- George Bernard Shaw
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Thanks Jorgen
Unfortunately it not my database to add columns.
I tried your query, but it was also slow, however that got me thinking more about the data I am querying. The vektronix table is actually quite large already after only a few months of production (about 8 rows for each unit produced) so I tried limiting the rows from vektronix in the where clause - that worked!
;WITH Dates AS
(
SELECT GETDATE()as DateValue
UNION ALL
SELECT DateValue -1
FROM Dates
WHERE DateValue -1 >= dateadd(d,-90,GETDATE())
)
SELECT convert(date,DateValue) as ProdDate , coalesce(trk.Tot,0)as ProdQty
FROM Dates D
left join (select convert(date,DateCreated) as TrkDate ,SUM(allocated) as Tot from vektronix.[dbo].[Tracking] t
where [TrackingTypeId] = '1' and DateCreated >= dateadd(d,-90,GETDATE())
group by convert(date,DateCreated))
as trk on trk.TrkDate = convert(date,DateValue)
group by DateValue,trk.Tot
order by datevalue desc
OPTION (MAXRECURSION 32747)
Thanks for your help!
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In SQL Server 2008R2, I two tables:
T1.V1
1
2
3
T2.V1 T1.V2
1 A
2 B
3 A
I tried:
SELECT T1.V1, COUNT(T2.V2) OVER(PARTITION T2.V2) AS MyCount
FROM T1
INNER JOIN T2 ON T1.V1 = T2.V1
and got what asked for not what I wanted.
What I want is the number of V2's in T2.
Output was:
V1 MyCount
1 1
2 1
3 1
Wanted
V1 MyCount
1 2
2 1
3 2
I hope my simplification of the problem gives enough information.
Thanks
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Not sure how you're getting to your "wanted" output, since each row in T1 is only related to a single row in T2.
The only way I can see you getting that result would be something like this:
SELECT
T1.V1,
COUNT(1) As MyCount
FROM
T1
INNER JOIN T2
ON T1.V1 = T2.V1
INNER JOIN T2 As X
ON T2.V2 = X.V2
GROUP BY
T1.V1
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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What I have used is a join to code does the count first. I was hoping for another way to do it.
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What is the format of the connection string used for Mysql access in PHP?
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Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
Mani Prabhakar
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Hi,
For some reason no matter what I try, this syntax is erroring out.
var dispQuestions = (from m in demographicList.Where(o => o.customertype=="Patient")).ToList();
It complains having a select or group by.
I tried this as well, and it still errors.
var dispQuestions = (from m in demographicList.Where(o => o.customertype=="Patient")).Select().ToList();
any thoughts?
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vkEmerson wrote: I tried this as well, and it still errors.
What's that? always include those details in your questions. Besides you have posted your question in wrong forum. Try LINQ forum[^]. Now don't repost this question there, leave it now. Hereafter choose right forum.
thatrajaNobody remains a virgin, Life screws everyone 
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I could not find the LINQ forum, under the discussion. I will book mark the linq forum for future.
if I try to get
dispQuestions.Count , there is an error message,
Error 5 Operator
Syntax wise, am I missing the format? I am used to ADO.Net, and new to Linq. Trying to figure the various way to write it.
Thanks.
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Try dispQuestions.Count() instead.
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The problem here is that you're mixing up the query syntax and the method syntax[^]. When the compiler is complaining that you're missing a select, it means that a query-syntax query must end with a select statement, but you've tried to fix it by adding a call to the Select method.
Your query could be written in one of two ways:
var dispQuestions = (from m in demographicList where m.customertype == "Patient" select m).ToList();
var dispQuestions = demographicList.Where(o => o.customertype == "Patient").ToList();
I tend to prefer the second option, but it's a purely aesthetic choice.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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.Net WPF app connecting to SQL 2008 R2 running on Win Server 2008
This is a recent problem. Probably started in the last day or two. Not sure because I haven't tested on the server since...
I have a WPF app that runs on a Win 8 Tablet. I have the tablet on my desk. I also have a copy on my client's server in Canada.
From my development PC the app CAN connect to SQL on my server. I copy the app to the tablet and run it and it does NOT connect. I get:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) ---> System.ComponentModel.Win32Exception (0x80004005): The system cannot find the file specified
I get the same trying to run it from the client's server. Both the tablet and the copy on the client's server were connecting a few days ago.
The server's IP/Port are hardcoded in (to test), so that hasn't changed.
I checked all the user remote connection settings. Everything looks fine. The part that worries me is the "File not found" part. And why do I NOT get this connecting from my Dev pc??
I need some help.
Thanks
If it's not broken, fix it until it is
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"The server's IP/Port are hardcoded in (to test), so that hasn't changed."
And that's a public IP address somewhere on the web where it can be reached without restrictions? Or is it something like 192.168.0.42?
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Bernhard Hiller wrote: And that's a public IP address somewhere on the web
Given that the OP said that it worked a couple of days ago and hasn't changed it thus follows that it is a public address.
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I have built a table in the database.But what is the reason that I can't insert data.
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Telepathy is a wonderful concept but it just doesn't work properly!
What database?
What is the error message?
What is you UI?
Just a little more information may help someone make a guess at the problem.
Never underestimate the power of human stupidity
RAH
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