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  • Efficiently select top row for each category in the set

    - by VladV
    I need to select a top row for each category from a known set (somewhat similar to this question). The problem is, how to make this query efficient on the large number of rows. For example, let's create a table that stores temperature recording in several places. CREATE TABLE #t ( placeId int, ts datetime, temp int, PRIMARY KEY (ts, placeId) ) -- insert some sample data SET NOCOUNT ON DECLARE @n int, @ts datetime SELECT @n = 1000, @ts = '2000-01-01' WHILE (@n>0) BEGIN INSERT INTO #t VALUES (@n % 10, @ts, @n % 37) IF (@n % 10 = 0) SET @ts = DATEADD(hour, 1, @ts) SET @n = @n - 1 END Now I need to get the latest recording for each of the places 1, 2, 3. This way is efficient, but doesn't scale well (and looks dirty). SELECT * FROM ( SELECT TOP 1 placeId, temp FROM #t WHERE placeId = 1 ORDER BY ts DESC ) t1 UNION ALL SELECT * FROM ( SELECT TOP 1 placeId, temp FROM #t WHERE placeId = 2 ORDER BY ts DESC ) t2 UNION ALL SELECT * FROM ( SELECT TOP 1 placeId, temp FROM #t WHERE placeId = 3 ORDER BY ts DESC ) t3 The following looks better but works much less efficiently (30% vs 70% according to the optimizer). SELECT placeId, ts, temp FROM ( SELECT placeId, ts, temp, ROW_NUMBER() OVER (PARTITION BY placeId ORDER BY ts DESC) rownum FROM #t WHERE placeId IN (1, 2, 3) ) t WHERE rownum = 1 The problem is, during the latter query execution plan a clustered index scan is performed on #t and 300 rows are retrieved, sorted, numbered, and then filtered, leaving only 3 rows. For the former query three times one row is fetched. Is there a way to perform the query efficiently without lots of unions?

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  • converting ID to column name and also replacing NULL with last known value.

    - by stackoverflowuser
    TABLE_A Rev ChangedBy ----------------------------- 1 A 2 B 3 C TABLE_B Rev Words ID ---------------------------- 1 description_1 52 1 history_1 54 2 description_2 52 3 history_2 54 Words column datatype is ntext. TABLE_C ID Name ----------------------------- 52 Description 54 History OUTPUT Rev ChangedBy Description History ------------------------------------------------ 1 A description_1 history_1 2 B description_2 history_1 3 C description_2 history_2 Description and History column will have the previous known values if they dont have value for that Rev no. i.e. Since for Rev no. 3 Description does not have an entry in TABLE_B hence the last known value description_2 appears in that column for Rev no. 3 in the output.

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  • Pushing a mail include to a java program

    - by Marthin
    Hi, I have a Windows Server that recives mail. These mail contains only 1 single CSV file. I want my server to automatically take the attachment from any incoming mail and send to a java program locally installed. Is there anyone who can give me directions on any programs that fix this or do I need to create some kind of windows service? Thankful for any help!

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  • Is it possible to create custom methods in entity classes in linq to sql

    - by doekman
    I have a table Site in SQL with (amongst others) three properties idReviewer1, idReviewer2, idReviewer3. Now I would like to create a methods on the entity class of Site to check if a user is a reviewer: partial class Site { public bool IsReviewer(int idUser) { return idReviewer1 == idUser || idReviewer2 == idUser || idReviewer3 == idUser; } } and I use it like this: return from s in db.Sites where s.IsReviewer(user) select s; However, Linq to SQL doesn't know how to translate this to SQL. I get the following error message: Method 'Boolean IsReviewer(Int32)' has no supported translation to SQL. I'd rather not write this: return from s in db.Sites where idReviewer1 == idUser || idReviewer2 == idUser || idReviewer3 == idUser select s; Is there any way to put this functionality in one place, without resorting to SQL?

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  • Query executes with no error but not in trigger

    - by liaqat ali
    I am facing a strange problem in creating trigger in MS SQL. I have a query that executes with out an error but when I place it within trigger body, it gives error Invalid column name 'ScreenName'. I am placing whole trigger code here. Please trace the issue. CREATE TRIGGER [dbo].[tr_tbFieldLabels_FieldLabelLength] ON [dbo].[tbFieldLabels] AFTER INSERT AS Update tbFieldLabels Set TextBoxLength = (SELECT top 1 TextboxLength FROM tbFieldLabelsSource FLS WHERE FLS.ScreenName = Inserted.ScreenName AND tbFieldLabelsSource.SystemName = Inserted.SystemName) FROM tbFieldLabels , Inserted WHERE tbFieldLabels.ID = Inserted.ID GO Please help me ASAP.

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  • Loading xml with encoding UTF 16 using XDocument

    - by Sangram
    Hi, I am trying to read the xml document using XDocument method . but i am getting an error when xml has <?xml version="1.0" encoding="utf-16"?> When i removed encoding manually.It works perfectly. I am getting error " There is no Unicode byte order mark. Cannot switch to Unicode. " i tried searching and i landed up here-- Why does C# XmlDocument.LoadXml(string) fail when an XML header is included? But could not solve my problem. My code : XDocument xdoc = XDocument.Load(path); Any suggestions ?? thank you.

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  • SQL Find duplicate sets

    - by Aheho
    given this Schema: table tblSET SetID int PK SetName nvarchar(100) Table tblSetItem SetID int PK ItemID int PK tblSetItem.SetID is a FK into the tblSet Table. Some data: tblSet SetID SetName 1 Red 2 Blue 3 Maroon 4 Yellow 5 Sky tblSetItem SetID ItemID 1 100 1 101 2 100 2 108 2 109 3 100 3 101 4 101 4 108 4 109 4 110 5 100 5 108 5 109 I'd like a way to identify which sets contain the same items. In the example above Red and Maroon contain the same items (100,101) and Blue and Sky contain the same values (100,108,109) Is there a sql query which would provide this answer?

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  • Why does "non exists" SQL query work and "not in" doesn't

    - by Josh
    I spent some time trying to figure out why this query isn't pulling the results i expected: SELECT * FROM NGS WHERE ESPSSN NOT IN (SELECT SSN FROM CENSUS) finally i tried writing the query another way and this ended up getting the expected results: SELECT * FROM NGS n WHERE NOT EXISTS (SELECT * FROM CENSUS WHERE SSN = n.ESPSSN) The first query seems more appropriate and "correct". I use "in" and "not in" all the time for similar selects and have never had a problem that i know of.

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  • SSRS Parameters Displaying incorrectly

    - by Ryan
    Basically, I have a datetime parameter, after picking a date with the calendar widget, the date will display correctly (12/1/2010 or 1-DEC-2010). If the parameter tab refreshes in any way, either from report processing or changing another of the parameters, the date flips the month and day (1-DEC-2010 becomes 12-Jan-2010, or 12/1/2010 becomes 1/12/2010). I'm utilizing the SSRS plugin for C# (Microsoft.Reporting.Winforms.ReportViewer). Has anyone seen anything like this?

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  • Why can one null return be tested but another throws an exception?

    - by mickey
    I want to test if an xml attribute is present. Given this: XmlAttributeCollection PG_attrColl = SomeNodeorAnother.Attributes; This first test works: if (null != PG_attrColl["SomeAttribute"]) "GetNamedItem" is supposed to return null, but the following test throws an exception complaining about the null it returns. if (null != PG_attrColl.GetNamedItem("SomeAttribute").Value;) Why the difference? Just curious.

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  • SQL Group by Minute- Expanded

    - by Barnie
    I am working on something similar to this post here: TS SQL - group by minute However mine is pulling from an message queue, and I need to see an accurate count of the amount of traffic the Message Queue is creating/ sending, and at what time Select * From MessageQueue mq My expanded version of this though is the following: A) User defines a start time and an end time (Easy enough using Declare's @StartTime and @EndTime B) Give the user the option of choosing the "grouping". Will it be broken out by 1 minutes, 5 minutes, 15 minutes, or 30 minutes (Max). (I had thought to do this with a CASE statement, but my test problems fall apart on me.) C) Display the data to accurately show a count of what happened during the interval (Grouping) selected. This is where I am at so far SQL Blob: DECLARE @StartTime datetime DECLARE @EndTime datetime SELECT DATEPART(n, mq.cre_date)/5 as Time --Trying to just sort by 5 minute intervals ,CONVERT(VARCHAR(10),mq.Cre_Date,101) ,COUNT(*) as results FROM dbo.MessageQueue mq WHERE mq.cre_date BETWEEN @StartDate AND @EndDate GROUP BY DATEPART(n, mq.cre_date)/5 --Trying to just sort by 5 minute intervals , eq.Cre_Date This is the output I would like to achieve: [Time] [Date] [Message Count] 1300 06/26/2012 5 1305 06/26/2012 1 1310 06/26/2012 100

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  • Return dataset in dataflow

    - by praveen
    Hi All, Could I get ideas on retrieving the dataset using lookup method. Basically, my scenario as I have source data needs to lookup for other source table and on matching column from source I need to get all the records from other source data. its a one to many relations. I tried Lookup but gives only one record on matching condition, OLE DB command don't retrieve any data as it will do only Insert/Update operations. Thanks prav

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  • non-english VS2008 + Resharper 4.5 = problems

    - by lak-b
    I have russian version of VS2008 (don't aske me why..) + R# 4.5. After installing R# these problems appear: Can't select text with "Ctrl+Shift+arrow" (no idea how to fix it) Can't use Resharper shortcut scheme. I have trying to apply R# scheme, rebooting VS - no luck. Seems like Russian VS have something different inside it, not only russian textboxes... Any ideas?

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  • How to remove duplicate records in a table?

    - by Mason Wheeler
    I've got a table in a testing DB that someone apparently got a little too trigger-happy on when running INSERT scripts to set it up. The schema looks like this: ID UNIQUEIDENTIFIER TYPE_INT SMALLINT SYSTEM_VALUE SMALLINT NAME VARCHAR MAPPED_VALUE VARCHAR It's supposed to have a few dozen rows. It has about 200,000, most of which are duplicates in which TYPE_INT, SYSTEM_VALUE, NAME and MAPPED_VALUE are all identical and ID is not. Now, I could probably make a script to clean this up that creates a temporary table in memory, uses INSERT .. SELECT DISTINCT to grab all the unique values, TRUNCATE the original table and then copy everything back. But is there a simpler way to do it, like a DELETE query with something special in the WHERE clause?

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  • I'd like to preview a Word document on form.

    - by Tychumsempir
    I'm writing a VB program that fills in values within a word document. I'm utilizing the Microsoft Word 12.0 Object Library as a Reference. I'd like to provide a scrollable preview pane to my user that is within the form he or she is using. It would be even cooler if the user could edit the document through this pane. I've done Interop extensively, so I'm well aware of how to write and edit a Word document. I just want to put it into a frame and preview it. I'll probably try to select around the document based on what is changing as the user provides input so they can see what's being changed and where. Thoughts? Thanks

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  • Sub Query making Query slow.

    - by Muhammad Kashif Nadeem
    Please copy and paste following script. DECLARE @MainTable TABLE(MainTablePkId int) INSERT INTO @MainTable SELECT 1 INSERT INTO @MainTable SELECT 2 DECLARE @SomeTable TABLE(SomeIdPk int, MainTablePkId int, ViewedTime1 datetime) INSERT INTO @SomeTable SELECT 1, 1, DATEADD(dd, -10, getdate()) INSERT INTO @SomeTable SELECT 2, 1, DATEADD(dd, -9, getdate()) INSERT INTO @SomeTable SELECT 3, 2, DATEADD(dd, -6, getdate()) DECLARE @SomeTableDetail TABLE(DetailIdPk int, SomeIdPk int, Viewed INT, ViewedTimeDetail datetime) INSERT INTO @SomeTableDetail SELECT 1, 1, 1, DATEADD(dd, -7, getdate()) INSERT INTO @SomeTableDetail SELECT 2, 2, NULL, DATEADD(dd, -6, getdate()) INSERT INTO @SomeTableDetail SELECT 3, 2, 2, DATEADD(dd, -8, getdate()) INSERT INTO @SomeTableDetail SELECT 4, 3, 1, DATEADD(dd, -6, getdate()) SELECT m.MainTablePkId, (SELECT COUNT(Viewed) FROM @SomeTableDetail), (SELECT TOP 1 s2.ViewedTimeDetail FROM @SomeTableDetail s2 INNER JOIN @SomeTable s1 ON s2.SomeIdPk = s1.SomeIdPk WHERE s1.MainTablePkId = m.MainTablePkId) FROM @MainTable m Above given script is just sample. I have long list of columns in SELECT and around 12+ columns in Sub Query. In my From clause there are around 8 tables. To fetch 2000 records full query take 21 seconds and if I remove Subquiries it just take 4 seconds. I have tried to optimize query using 'Database Engine Tuning Advisor' and on adding new advised indexes and statistics but these changes make query time even bad. Note: As I have mentioned that this is test data to explain my question the real data has lot of tables joins columns but without Sub-Query the results us fine. Any help thanks.

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  • SQL Server to manage ASP.NET sessions doesn't work

    - by windforceus
    I follow the direction in here How to configure SQL Server to manage ASP.NET sessions to create ASPState db. I have 2 web application in IIS 7. In IIS web application setting, i go to "Session State" and set session state as "SQL Server" and provide connection string. In each web application web.config, i add <sessionState mode="SQLServer" allowCustomSqlDatabase="false" sqlConnectionString="data source=server;user id=user;password=password" cookieless="false" timeout="7200" /> I create a session , Session["Data"] = "test" in Web App A and go to Web App B in the same browser to print it Response.Write(Session["Data"]); It shows NOTHING. I can see there are data in table : ASPStateTempApplications and ASPStateTempSessions under ASPState Database. Also, i dont see any error in event log. Can anyone think anything i may do wrong? Thanks!!

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  • SELECT..CASE - Refactor T-SQL

    - by Nev_Rahd
    Hello Can I refactor the below SQL CASE statements into single for each case ? SELECT CASE RDV.DOMAIN_CODE WHEN 'L' THEN CN.FAMILY_NAME ELSE NULL END AS [LEGAL_FAMILY_NAME], CASE RDV.DOMAIN_CODE WHEN 'L' THEN CN.GIVEN_NAME ELSE NULL END AS [LEGAL_GIVEN_NAME], CASE RDV.DOMAIN_CODE WHEN 'L' THEN CN.MIDDLE_NAMES ELSE NULL END AS [LEGAL_MIDDLE_NAMES], CASE RDV.DOMAIN_CODE WHEN 'L' THEN CN.NAME_TITLE ELSE NULL END AS [LEGAL_NAME_TITLE], CASE RDV.DOMAIN_CODE WHEN 'P' THEN CN.FAMILY_NAME ELSE NULL END AS [PREFERRED_FAMILY_NAME], CASE RDV.DOMAIN_CODE WHEN 'P' THEN CN.GIVEN_NAME ELSE NULL END AS [PREFERRED_GIVEN_NAME], CASE RDV.DOMAIN_CODE WHEN 'P' THEN CN.MIDDLE_NAMES ELSE NULL END AS [PREFERRED_MIDDLE_NAMES], CASE RDV.DOMAIN_CODE WHEN 'P' THEN CN.NAME_TITLE ELSE NULL END AS [PREFERRED_NAME_TITLE] FROM dbo.CLIENT_NAME CN JOIN dbo.REFERENCE_DOMAIN_VALUE RDV ON CN.NAME_TYPE_CODE = RDV.DOMAIN_CODE AND RDV.REFERENCE_DOMAIN_ID = '7966'

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