Aggregate Only Top 20 Records In A Table- MSSQL2000
Jul 20, 2005
Hi All
I need to aggregate a query to produce the following:
Workplace Avg
M100 4.7
M120 3.45
Which would be a normal aggregate:
SELECT Workplace, Avg(VALUE)
FROM PROD
GROUP BY Workplace
However I need the average to only be based on the most recent 20
results from each of the Workplace groups.
I've never had to do something like this before so can't think of any
way to only take off the most recent 20 for each group (ordered by
Date). It doesn't really matter if there were 25 spread across 2 days
I would just cut the list at 20 VALUEs as there is no time component
invloved.
Is there any way to do a sub-query that uses select top 20 ... for
each group that could then be aggregated?
I would prefer to do it through a select statement rather than having
to use a stored procedure using and variables, etc which I can do. The
table is not huge but is growing rapidly so I'm concerned that
anything using dyamic SQL or similar would be become painfully as the
number of groups grows to 5,000 or more.
If anyone has any ideas they would be greatly appreciated.
I have struggled and can't seem to get the SQL correct to get the records I want. I have 2 tables containing information from 2 separate independant sensor arrays which collect data about trains in a rail network. I need to get the most current records about the trains at any given time.
For any given moment in time, I want to query the database and get the last known position of each train and it's status. So I want a result table like this: given time = 10:07:20 TrainId | PosTime | X | Y | StatusTime | SensorId | Delay | OffDuty 109 | 5/10/2007 10:07:15 | 62389 | 25002 | 5/10/2007 10:06:51 | 75 | -5 | N 210 | 5/10/2007 10:07:15 | 65489 | 25432 | 5/10/2007 10:04:54 | 85 | -10 | Y 857 | 5/10/2007 10:07:15 | 62889 | 25983 | 5/10/2007 10:05:21 | 231 | +1 | N
OR given time=10:03:30 1 | 109 | 5/10/2007 10:03:30 | someX | someY | 5/10/2007 10:02:34 | 72 | -3 | N 2 | 210 | 5/10/2007 10:03:30 | someX | someY | null | null | null | null (Since train 210 it hasn't tripped a status sensor yet, we don't know it's status at that time) 3 | 857 | 5/10/2007 10:03:30 | someX | someY | 5/10/2007 10:02:48 | 199 | +2 | N
Any help to achieve these results would be MOST appreciated, Thanks.
Okay heres the problem I'm facing. I have GoDaddy as my hosting company. They only support MSSQL2000 but I just recently bought MSSQL2005 Developer Edition. And I was wondering what is the main difference between them two. I didn't find anything on Google. And the only thing is I can't find a better host. Cause I have 50GB of space and 500GB of bandwidth. And I don't want to lose that for just MSSQL2005 support cause my host doesn't/ Have that. So im stuck like chuck. Is there really any difference?
HELP! I'm new to SQL Server and I'm sure this is a simple problem. But I can't seem to solve it. Here's the problem: My website & MS SQL 2000 Server are being hosted by Networksolutions. Thru the Client Enterprise Manager I am Unable to create a New Table. This is the error message I get: " [MS Design Tools]-ODBC error: [Microsoft] [ODBC SQL SERVER DRIVER] [SQL SERVER] SELECT permission denied on object 'sysobjects', database 'namedb', owner'db' " :confused:
Is there a way to transfer ntext data from one table to another?I tried thisUPDATE [projects]SET [description] = (SELECT [description_ntext] FROM [table] WHERE[id]=1)WHERE [id_project] = 1;and thisDECLARE @DESCRIPTION ntextSET @DESCRIPTION = (SELECT [bids].[bid_conditions] FROM [bids],[projects] WHERE [bid_accepted_id] = [bids].[id_bid] AND [id_project] =@ID_PROJECT);UPDATE [projects]SET [description] = @DESCRIPTIONWHERE [id_project] = 1;none of those work in MSSQL2K,error reported is "The text, ntext, and image data types are invalidfor local variables."
I want to update sum of a field from another table to first table
TABLE ONE: ========== ItemID QtyInStock
Table TWO: ========== BatchID ItemID Qty
I want to Update the QtyInStock of First Table with Sum(Batch.Qty)
here is the query i am writing but giving error
UPDATE ITEMS SET INSTOCKQTY=CASE WHEN QtyInBatch>1 THEN QTYINBATCH ELSE 0 END FROM ITEMS, ( SELECT ITEMS.ITEMID, SUM(Batch.Qty) AS QtyInBatch FROM Batch INNER JOIN Items ON Batch.ItemID = Items.ItemID GROUP BY ITEMS.ITEMID )
appericiating anyones help in advance
FAZEEL AMJAD Systems Engineer Crystal Technologies
I have a a Group By query which is working fine aggregating records by city. Now I have a requirement to focus on one city and then group the other cities to 'Other'. Here is the query which works:
Select [City]= CASE WHEN [City] = 'St. Louis' THEN 'St. Louis' ELSE 'Other Missouri City' END, SUM([Cars]) AS 'Total Cars' From [Output-MarketAnalysis] Where [City] IN ('St. Louis','Kansas City','Columbia', 'Jefferson City','Joplin') AND [Status] = 'Active' Group by [City]
Here is the result:
St. Louis 1000 Kansas City 800 Columbia 700 Jefferson City 650 Joplin 300
When I add this Case When statement to roll up the city information it changes the name of the city to 'Other Missouri City' however it does not aggregate all Cities with the value 'Other Missouri City':
Select [City]= CASE WHEN [City] = 'St. Louis' THEN 'St. Louis' ELSE 'Other Missouri City' END, SUM([Cars]) AS 'Total Cars' From [Output-MarketAnalysis] Where [City] IN ('St. Louis','Kansas City','Columbia', 'Jefferson City','Joplin') AND [Status] = 'Active' Group by [City]
Here is the result:
St. Louis 1000 Other Missouri City 800 Other Missouri City 700 Other Missouri City 650 Other Missouri City 300
Ok, I'm really new at this, but I am looking for a way to automatically insert new records into tables. I have one primary table with a primary key id that is automatically generated on insert and 3 other tables that have foreign keys pointing to the primary key. Is there a way to automatically create new records in the foreign tables that will have the new id? Would this be a job for a trigger, stored procedure? I admit I haven't studied up on those yet--I am learning things as I need them. Thanks.
Table2 contains fields Group, Name,Category, Dimension (Group and Name are not in Table1)
So basically I need to read the records in Table1 using Groupid and each time there is a Groupid then select records from Table2 where Table2.Category in (Select Catergory from Table1) and Table2.Dimension in (Select Dimension from Table1)
In Table1 There might be 10 Groupid records all of which are different.
I am trying to write a query that will retrieve all students of a particular class and also any rows in HomeworkLogLine if they exist (but return null if there is no row). I thought this should be a relatively simple LEFT join but I've tried every possible combination of joins but it's not working.
SELECT Student.StudentSurname + ', ' + Student.StudentForename AS Fullname, HomeworkLogLine.HomeworkLogLineTimestamp, HomeworkLog.HomeworkLogDescription, ROW_NUMBER() OVER (PARTITION BY HomeworkLogLine.HomeworkLogLineStudentID ORDER BY
[Code] ...
It's only returning two rows (the students where they have a row in the HomeworkLogLine table).
Hello, i have a table called tblschedule that has field for resourceID, employeeID, and scheduleDate. And also i have another table called tblResource that has resourceID and ResourceName. The third table called tblEmployee has employeeID, employeeFirstName and employeeLastname. I want to get a report for each resourceName (not ResourceID) that per employee schedule (COUNT). I need the report has ResourceName field, employeeName field and count. How can i write a store procedure as it need join three table to get the count. Thank you very much!
I have two tables. One has Projects with the total amt of hours worked on the project itself. The other is an Employee_Projects table with individual rows of hrs per employee worked on the above referenced projects.
I need to SUM all the hrs from the Employee_Projects table and GROUP BY project number, then UPDATE the Projects table with the sum of hours where the Project Number from table A matches the Project Number from table B.
Of course, you cant use an aggregate function in an UPDATE clause, so what would be the easiest way to do this??
Can someone please help me with a better way to format the following query. This works, but I know it is hidious.
Code Snippet
select
convert(varchar, processed, 101) as Date, count(o.id) as [# Orders], sum(distinct a.runnercount) as [# Runners], sum(o.total) as [$ Gross], sum(o.fee) as [$ Fees], (sum(o.total)-sum(o.fee)) as [$ Net]
from [order] o join (select convert(varchar,processed,101) as date, count(*) as runnercount from orderitem oi inner join [order] o on o.id = oi.orderid where typeofextraid = 4 group by convert(varchar,processed,101)) a on convert(varchar,processed,101) = a.date
where statemented = @statemented group by convert(varchar, processed, 101) 2 tables: Order and OrderItem. I need the sum of a specific record type from the OrderItem table along with all the other aggregate columns group by day.
Is this possible? What I am looking for is something like:UPDATE T_SitesSET T_Sites.LastDate = T_Inspections.DateFROM T_SitesINNER JOIN T_Assets ON T_Sites.SiteID = T_Assets.AssetIDLEFT OUTER JOIN T_Insecptions ON T_Assets.AssetID = T_Inspections.AssetID-- But I need only the last inspection done on the site (including if it is null)
I can't get my head around this:I want to select all IDs from table A that do not have a related record intable B according to some condition:Table A contains, say, Parents and table B contains Children. I want toselect all Parents that have no children called "Sally" (this is a noddyexample, reminds me of being at Uni again :) ).Any ideas?Thanks
I have a situation where deleting old records is blocking updating latest records on highly transactional table and getting timeout errors from application.
In details, I have one table called Tran_table1 in OLTP database. This Tran_table1 is highly transactional table, it will receive data for insert/update continuously
While archiving 2 years old records from Tran_table1 into Tran_table1_archive in batches(using DELETE OUTPUT INTO clause), if there is any UPDATEs on Tran_table1,these updates are getting blocked and result is timeout errors in application.
Is there any SQL Server hints to avoid blocking ..
Hi everyone. I am updating a table with aggregate results for multiplecolumns. Below is an example of how I approached this. It works finebut is pretty slow. Anyone have an idea how to increase performance.Thanks for any help.UPDATE #MyTableSET HireDate=(Select Min(Case When Code = 'OHDATE' then DateChangedelse null end)From HREHWhere #MyTable.HRCo=HREH.HRCo and#MyTable.HRRef=HREH.HRRef ),TerminationDate=(select Max(Case When Type = 'N' thenDateChanged else null end)From HREHWhere #MyTable.HRCo=HREH.HRCo and#MyTable.HRRef=HREH.HRRef ),ReHireDate=(select MAX(Case When Code = 'HIRE' thenDateChanged else null end)From HREHWhere #MyTable.HRCo=HREH.HRCo and #MyTable.HRRef=HREH.HRRef )
I have a table with about half a million records, each representing a patient in my county.
Each record has a field (RRank) which basically sorts the patients as to how "unwell" they are according to a previously-applied algorithm. The most unwell patient has an RRank of 1, the next-most unwell has RRank=2 etc.
I have just deleted several hundred records (which relate to patients now deceased) from the table, thereby leaving gaps in the RRank sequence. I want to renumber the remaining recs to get rid of the gaps.
I can see what I want to accomplish by using ROW_NUMBER, thus:
SELECT ROW_NUMBER() Over (ORDER BY RRank) as RecNumber, RRank FROM RPL ORDER BY RRank
I see the numbers in the RecNumber column falling behind the RRank as I scan down the results
My question is: How to convert this into an UPDATE statement? I had hoped that I could do something like:
UPDATE RISC_PatientList_TEMP SET RRank = ROW_NUMBER() Over (ORDER BY RRank);
but the system informs that window functions will only work on SELECT (which UPDATE isn't) or ORDER BY (which I can't legally add).
Hi May I ask how to export MSSQL2000 DB to *.sql with all existing data? As I built the DB on local machine, the remote machine only provide SQL Server Web Admin which has Query Analyzer only. I can export a *.sql file, but there are no data. Thanks for help
Hi! I am a newbie using MSQL so please patience. I compact my database with DATABASE SHRINK(DB,10) BACKUP LOG data WITH TRUNCATE DATABASE SHRINK(DB,10)
When I see the properties of my DB I see something strange 1- My log always has 1 mb of space 2- Database properties show me this information:
Size: 21639.23MB Space Available: 782.23
Backup Last database backup: 9/28/2007 1:44am Last transaction log backup 6/9/2007 12:47 pm
I am so afraid because this says that I just have 782.23MB but my disk has 30GB yet.
Ok, so this 3rd party application we have exhibits some interesting behavior; when you amend any table through it's interface it drops and re-adds the object; meaning all permissions to the object are also removed. (Just take my word for it when I say that the table changes have to be done through this app).
Now, I've built a little application that hooks into this using an SQL Server authenticated user account with SELECT only permission on particular tables. Currently the app uses sprocs to access data. However, when changes were made to the schema last week; the application, obviously, received permission errors and ground to a nice halt.
I know that in 2005 we have the lovely EXECUTE AS statement; but I'm running a 65compaability database here and don't have that functionality.
Any ideas on how I can sort this mess out?
Hope I explained this well enough, let me know if you need any more info
Hi, I have a bunch of data from tables on MS SQL 2000 and i want to transfer this data to my new database running on MS SQL 2005. How do i perform bcp on this? thanks :D
Hi Group,I developed a intranet site using MSSQL7/win2000 some time ago.The target environment used MSSQL2000/8.We were (almost painlessly) able to import the db-scheme and data from 7to 8. (Bravo MSSQL)Now I need to do some upgrading on the application and I would like tohave a copy of the database from MSSQL2000/8 to MSSQL7.Is that also possible?Or should I download Microsoft SQL Server Express and use that insteadof my MSSQL7? Is it better?I hope I can get the relationsheet too (that one with Foreign Keysmapped in a nice graphical way).Any advise highly appreciated.I am good with Postgresql, but my MSSQL skills leave a lot to bedesired. :-/For an outsider like me the many versions and OS's are quite confusing.Do I need special commands on MSSQL2000/8 to create a MSSQL7 compatibleexport?Thanks in advance!Regards,Erwin Moller
Hi, i am having problem to install sql2000 server, the steps i did are:1. Local machine -> next2. Create a new instance of SQL server -> next3. type name and company -> next4. accept -> next5. Server and client tools -> next6. Default -> next7. Typical -> next8. use the same account ... and Use the Local system account -> next9. Mixed mode , passward -> nextwhatever options i choose, the installation program of sql will exitafter step9. just don't know what the problem is. please help thanks:)
Hi.. Never used MSSQL 2000 db. I have this website that uses mssql2000. I want to export it and convert db in mysql. Please help me understand how i can do that. I have all login info..
I have mssql2000 running on a Windows 2003 server and now have a requirement to run an Oracle 10g database as well. Is it possible to run both mssql2000 and oracle 10g on the same server without running into any conflicts or will the two programs cause errors with each other?
Anyone have any experience with this? Oracle says it's technically possible but the tech had never seen it done.
Hi, I'm executing a stored procedure in my local LAN which executes another one in a loop and I update a Table. The number of loops is about 6300. This operation takes about 25 seconds in my local LAN. Then I try to execute though in a VPN which has an upload speed of 256 kbps. I open query analyser connect to the remote server which is must faster than mine and I just write exec mystoredprocname in order to execute the procedure. The performance is very very slow. In 7 minutes 180 loops are completed out or 6300. I really cannot understand this. What is the reason of such slow perfomance?? My ADSL model displays no activity when the procedure is executed. I just use the PRINT method in MSSQL in order to display the progress of the operation. I tried to comment it out but with no difference. I also use SET NOCOUNT ON in order not to display the update results.
Can someone explain me the cause for this? Are there some tricks in order to improve the performance when a slow connection is used like a ADSL with a static IP? It seems that something wrong is happening here.
Hello!Does anybody know whether mssql2000 and emc mirrorvew _certified_ forjoint work?(Mirrorview is a fc-based remote mirroring solution)I mean is it supported from the MS point of view to put mssqldatafiles on emc mirrorview volumes?For example Oracle corp. has "Oracle Compatible Remote MirroringTechnologies" certification.But what about MS?
(MSSQL2000) I have read the transaction/locking sections in theMS-help, online and several books. What I want to understand is thetransaction behavior in single statements [not a BEGIN TRANSACTIONStatement1, Statement2... COMMIT].If I have a Table: "Letters" with 1 column "L" and the table presentlyhas rows{A,B,C,D}Case 1 (Insert):First start transaction T1 "SELECT * FROM Letters"Next start transaction T2 [separate connection] "INSERT INTO LettersVALUES( 'Z' )"Is it possible that T2 ends before T1 and the select returns{A,B,C,D,Z}Is it possible that T1 ends before T2 and the select returns{A,B,C,D} [No 'Z']Is this a race condition and I need to use a TABLOCK or TABLOCKX;and are TABLOCK/TABLOCKX only hints? I mean does the use of TABLOCKguarantee a lock on the table? Do I need to use 'SET TRANSACTIONISOLATION LEVEL SERIALIZABLE' and if I use 'TRANSACTION ISOLATIONLEVEL' is there a means of telling the system which tables I willtouch so that I can avoid a deadlock [upfront tell the system whattables I need to lock so there is not a race later]?Case 2 (Delete basically the same):First start transaction T1 "SELECT * FROM Letters"Next start transaction T2 "DELETE FROM Letters L = 'D'"Is it possible that T2 ends before T1 and the select returns {A,B,C}[No 'D']Is it possible that T1 ends before T2 and the select returns{A,B,C,D}Case 3 (Update basically the same):First start transaction T1 "SELECT * FROM Letters"Next start transaction T2 "UPDATE Letters SET L = 'Z'"Is it possible that T2 ends before T1 and the select returns{A,B,Z,Z} [Some letters were seen to become 'Z']Is it possible that T1 ends before T2 and the select returns{A,B,C,D}
Here I got some problems with my application. (ASP & English Version SQL Server 2000)
As we are using English MSSQL Server 2000, we got some new functions and we have to facilitate support of Chinese characters in the DB. I have set the collation for those Chinese fields already and those queries or Stored Procs for Chinese are working fine, ONLY if I execute them in Enterprise Manager. Chinese characters can be displayed in the relevant tables.
However here comes the big problem and I got really frustrated. As we will provide user interface in ASP pages, we 'll let users to insert the information which will be sent to the DB. If there's Chinese characters in the query string, the Chinese characters added in the DB would be garbled.
e.g. EXECUTE proc_TestChinese 'XYZ', 'test123' (assume XYZ be those Chinese words)
I am wondering if there's any way I can solve this problem. Should I add special handling for these Chinese words? I have set the ASP pages in UTF-8 or Big5 encoding but it doesn't help. Hope you experts can show me the way out of the mess. Thanks in advance!
I have a datadabase with 1 datafile from 60Gb. Is it a good thing(preformance) to split up this datafile in smaller datafiles from 6Gb each? I don't have separete diskslices so a can't spread my datafiles on my disks but i only need to know if a datafile from 60Gb sin't too big for MSSQL2000.
