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  • SQL - get latest records from table where field is unique

    - by 89stevenharris
    I have a table of data as follows id status conversation_id message_id date_created 1 1 1 72 2012-01-01 00:00:00 2 2 1 87 2012-03-03 00:00:00 3 2 2 95 2012-05-05 00:00:00 I want to get all the rows from the table in date_created DESC order, but only one row per conversation_id. So in the case of the example data above, I would want to get the rows with id 2 and 3. Any advice is much appreciated.

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  • CASE statement within WHERE statement

    - by niao
    Greetings, I would like to include CASE Statement inside my where statement as follows: SELECT a1.ROWGUID FROM Table1 a1 INNER JOIN Table2 a2 on a1.ROWGUID=a2.Table1ROWGUID WHERE a1.Title='title' AND (CASE WHEN @variable is not null THEN a1.ROWGUID in (SELECT * FROM #TempTable)) However, this 'CASE' statement does not work inside 'WHERE' statement. How can I do it correct?

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  • SQL: Find the max record per group

    - by user319088
    I have one table, which has three fields and data. Name , Top , Total cat , 1 , 10 dog , 2 , 7 cat , 3 , 20 horse , 4 , 4 cat , 5 , 10 dog , 6 , 9 I want to select the record which has highest value of Total for each Name, so my result should be like this: Name , Top , Total cat , 3 , 20 horse , 4 , 4 Dog , 6 , 9 I tried group by name order by total, but it give top most record of group by result. Can anyone guide me, please?

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  • Help with Oracle SQL Count function! =)

    - by user363024
    Hi guys.. The question im struggling with is this: i have a list of helicopter names in different charters and i need to find out WHICH helicopter has the least amount of charters booked. Once i find that out i need to ONLY display the one that has the least. I so far have this: SELECT Helicopter_Name COUNT (Distinct Charter_NUM) FROM Charter_Table GROUP BY Helicopter Name ^ this is where i am stuck, i realise MIN could be used to pick out the value that is the smallest but i am not sure how to integrate this into the command. Something like Where MIN = MIN Value Id really appreciate it

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  • SQL INSERT performance omitting field names?

    - by Marco Demaio
    Does anyone knows if removing the field names from an INSERT query results in some performance improvements? I mean is this: INSERT INTO table1 VALUES (value1, value2, ...) faster for DB to be accomplished rather than doing this: INSERT INTO table1 (field1, field2, ...) VALUES (value1, value2, ...) ? I know it might be probably a meaningless performance difference, but just to know.

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  • Inserting Strings Without Trailing Spaces SQL

    - by Soo
    I have a database with a field named Field1 that has 100 nchars per entry. Each time I add a value, it is stored as: "value (100-ValueLength Spaces) " So Basically each stored value has a string of spaces after it. This is getting to be an issue when I try doing: if (value == "Example") because of all of the empty spaces after the string. How can I get it so the stored values don't have all of these trailing spaces?

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  • Timeout in LINQ to SQL inserting millions of records

    - by Bas
    I'm inserting approximently 3 million records in a database using this solution. Eventually when the application has been inserting records for a while (my last run lasted around 4 hours), it gives a timeout with the following SqlException: "SqlExcepetion: Timeout expired. The timeoutperiod elapsed prior to completion of the operation or the server is not responding." What's the best way to handle this exception? Is there a way to prevent this from happening or should I catch the exception? Thanks in advance!

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  • using PIVOT to sql server.

    - by NoviceToDotNet
    This is the abstract idea which i want to do by my first select of first line, i am presenting here, but i am unable to do that correct. here category[0], category[2]..etc representing the category columns values...i know this kind of syntax not work, but i want to do something like this. SELECT category[0], category[1], category[2], category[3], category[4], category[5] FROM( select Row_number() OVER(ORDER BY (SELECT 1)) AS 'Serial Number', EP.FirstName,Ep.LastName, Ep.SignUpID, [dbo].[GetBookingRoleName](ES.UserId,EP.BookingRole) as RoleName, (select top 1 convert(varchar(10),eventDate,103)from [3rdi_EventDates] where EventId=@ItemId) as EventDate, (CASE [dbo].[GetBookingRoleName](ES.UserId,EP.BookingRole) WHEN 'Employee - Marketing' THEN 'DC' WHEN 'Employee - Accounting' THEN 'DC' WHEN 'Coaches' THEN 'DC' WHEN 'Student Client' THEN 'ST' WHEN 'Guest Doctor' THEN 'GDC' ---....more categories here, i just removed a few END) as Category from [3rdi_EventParticipants] as EP inner join [3rdi_EventSignup] as ES on EP.SignUpId = ES.SignUpId WHERE EP.EventId = @ItemId AND EP.PlaceStatus IN (0,3,4,8) and userid in( select distinct userid from userroles where roleid not in(19,20,21,22) and roleid not in(1,2, 25, 44)) (My Below Query) PIVOT(sum(First_Name+Last_Name)) FOR Category (category[0], category[1], category[2], category[3], category[4], category[5]) Group by (SignUpID)

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  • oracle sql query to list all the dates of previous month

    - by Suresh S
    Guys i have a requirement to list all the dates of the previous month like below 20101201 20101202 20101203 20101204 20101205 .. .. .. .. .. .. .. .. 20101231 kindly let me know if any better way to do than this query. select TO_CHAR(TRUNC(SYSDATE,'MM')-1,'YYYYMMDD')-(level-1) as EACH_DATE from dual A connect by level < (TO_NUMBER(TO_CHAR(TRUNC(SYSDATE,'MM')-1,'DD'))+1) Also please let me know the problem with this query it says "missing right parenthesis" SELECT /*+ PARALLEL (A,8) */ /*+ DRIVING_STATE */ TO_CHAR(TRUNC(TRUNC(SYSDATE,'MM')-1,'MM'),'MONYYYY') "MONTH", TYPE AS "TRAFF", COLUMN, A_COUN AS "A_COUNT",COST FROM DATA_P B WHERE EXISTS ( select TO_NUMBER(TO_CHAR(TRUNC(SYSDATE,'MM')-1,'YYYYMMDD')-(level-1)) EACH_DATE from dual A connect by level < TO_NUMBER(TO_CHAR(TRUNC(SYSDATE,'MM')-1,'DD')+1) WHERE A.EACH_DATE = B.DATE order by EACH_DATE ASC )

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  • Help needed with Linq To Sql Query

    - by fearofawhackplanet
    I have the concept of valid/ordered transitions. So for example, it's not possible to move to status In progress from status Complete. Current and Next in table StatusTransition are FK (StatusType.Id). The Linq generator has created the following relations: Child Property Name: StatusTransitions1 Parent Property Name: StatusType1 Participating Properties: StatusType.Id -> StatusTransition.Next Child Property Name: StatusTransitions Parent Property Name: StatusType Participating Properties: StatusType.Id -> StatusTransition.Current I'm normally ok with Linq but I'm having difficulty getting the list of valid Next StatusTypes from the Current status. public List<StatusType> GetValidStatusTransitions(int statusId) { // trying to write something like the following // (obviously not correct) return _statusRepository .Where(s => s.Id == statusId) .Next.StatusTypes; }

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  • Sql: simultaneous aggregate from two tables

    - by Ash
    I have two tables: a Files table, which includes the file type, and a File Properties table, which references the file table via a foreign key. Sample Files table: | id | name | type | --------------------- | 1 | file1 | zip | | 2 | file2 | zip | | 3 | file3 | zip | | 4 | file4 | jpg | And the Properties table: | file_id | property | ----------------------- | 1 | x | | 2 | x | I want to make a query, which shows the count of each file type, and how many files of that type have a property. So in the example, the result would be | type | filecount | prop count | ---------------------------------- | zip | 3 | 2 | | jpg | 1 | 0 | I could accomplish this by select f.type, (select count(id) from files where type = f.type), count(fp.id) from files as f, file_properties as fp where f.id = fp.file_id group by f.type; But this seems very suboptimal and is very slow. Any better way to do this?

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  • SQL for total count and count within that where condition is true

    - by twmulloy
    Hello, I have a single user table and I'm trying to come up with a query that returns the total count of all users grouped by date along with the total count of users grouped by date who are of a specific client. Here is what I have thus far, where there's the total count of users grouped by date, but can't seem to figure out how to get the count of those users where user.client_id = x SELECT user.created, COUNT(user.id) AS overall_count FROM user GROUP BY DATE(user.created) trying for a row result like this: [created] => 2010-05-15 19:59:30 [overall_count] => 10 [client_count] => (some fraction of overall count, the number of users where user.client_id = x grouped by date)

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  • SQL Trigger dont works...

    - by Gabotron
    Is there a way in which a Trigger is not fired? We have this situation: We have a table and there are rows that are been deleted. We need to know who and/or when these row are deleted. We create this trigger: ALTER TRIGGER [dbo].[AUDITdel_nit] ON [dbo].[Client] FOR DELETE AS Insert into AUDIT select 'Delete', getdate(), 'Row Deleted', SYSTEM_USER, host_name(), (select 'ID Client: ' + convert(varchar(12),Id) from deleted), 'Client' ,APP_NAME() We made somte test: deleting rows vis stored procedures and the deleted rows appears in our AUDIT table. But suddenly today we found a row deleted that dont appears in the AUDIT table... Any idea how it can be done?

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  • SQL query showing missing expression

    - by Ashok Dasari
    Query to pull the data between Yseterday 6AM to today 6AM ... SELECT lot_id, log_time, batch_no, eqp_id, STATION_ID, EXTRACTVALUE (META_DATA, '/lot_info/A3') AS A3, EXTRACTVALUE (META_DATA, '/lot_info/A3Info') AS A3Info, EXTRACTVALUE ( META_DATA, '/lot_info/apc_status_info' ) AS apc_status_info FROM t_dlis_log_history WHERE ( (EQP_ID = 'ALC4360') OR (EQP_ID = 'ALC4361') OR (EQP_ID = 'ALC1360') OR (EQP_ID = 'ALC1361') OR (EQP_ID = 'ALC1362') OR (EQP_ID = 'ALC1363') OR (EQP_ID = 'ALC1364') OR (EQP_ID = 'ALC1365') OR (EQP_ID = 'ALC355') OR (EQP_ID = 'ALC353') OR (EQP_ID = 'ALC4350') OR (EQP_ID = 'ALC354') ) AND (( log_time >= DATEADD ( HOUR, 6, CONVERT(VARCHAR (10), GETDATE (), 110) ) AND ( log_time <= DATEADD ( HOUR, 6, CONVERT(VARCHAR (10), GETDATE () + 1, 110) ) ) ) It is showing error missing expression ...

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  • Multiple Table Joins to Improve Performance?

    - by EdenMachine
    If I have a table structure like this: Transaction [TransID, ...] Document [DocID, TransID, ...] Signer [SignerID, ...] Signature [SigID, DocID, SignerID, ...] And the business logic is like this: Transactions can have multiple documents Documents can have multiple signatures And the same signer can have multiple signatures in multiple documents within the same transaction So, now to my actual question: If I wanted to find all the documents in a particular transaction, would it be better, performance-wise, if I also stored the TransID and the DocID in the Signer table as well so I have smaller joins. Otherwise, I'd have to join through the Signature Document Transaction Documents to get all the documents in the transaction for that signer. I think it's really messy to have that many relationships in the Signer table though and it doesn't seem "correct" to do it that way (also seems like an update nightmare) but I can see that it might be better performance for direct joins. Thoughts? TIA!

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  • Find overdrawn accounts in SQL

    - by mazzzzz
    Hey guys, I have a program that allows me to run queries against a large database. I have two tables that are important right now, Deposits and withdraws. Each contains a history of every user. I need to take each table, add up every deposit and withdraws (per user), then subtract the withdraws from the deposits. I then need to return every user whos result is negative (aka they withdrew more then they deposited). Is this possible in one query? Example: Deposit Table: |ID|UserName|Amount| |1 | Use1 |100.00| |2 | Use1 |50.00 | |3 | Use2 |25.00 | |4 | Use1 | 5.00 | WithDraw Table: |ID|UserName|Amount| |2 | Use2 | 5.00 | |1 | Use1 |100.00| |4 | Use1 | 5.00 | |3 | Use2 |25.00 | So then the result would output: |OverWithdrawers| | Use2 | Is this possible (I sure don't know how to do it)? Thanks for any help, Max

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  • Can't get DataGridView to refresh over Linq to SQL (WinForm)

    - by GringoFrenzy
    Very strange situation here: I'm using L2S to populate a DataGridView. Code follows: private void RefreshUserGrid() { var UserQuery = from userRecord in this.DataContext.tblUsers orderby userRecord.DisplayName select userRecord; UsersGridView.DataSource = UserQuery; //I have also tried //this.UserBindingSource.DataSource = UserQuery; //UsersGridView.Datasource = UserBindingSource; UsersGridView.Columns[0].Visible = false; } Whenever I use L2S to Add/Delete records from the database, the GridView refreshes perfectly well. However, if someone is editing the grid and makes a mistake, I want them to be able to hit a refresh button and have their mistakes erased by reloading from the datasource. For the life of me, I can't get it to work. The code I am currently using on my refresh button is this: private void button1_Click(object sender, EventArgs e) { this.DataContext.Refresh(RefreshMode.OverwriteCurrentValues); RefreshUserGrid(); } But the damn GridView remains unaffected. All that happens is the selected row becomes unselected. I have tried .Refresh(), .Invalidate(), I've tried changing the DataSource to NULL and back again (all suggestions from similar posts here)....none of it works. The only time the Grid refreshes is if I restart the app. I must be missing something fundamental, but I'm totally stumped and so are my colleagues. Any ideas? Thanks!

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  • SQL, problem with OrderBy / GroupBy

    - by Tristan
    Hi, In my table I have two fields among others : article_id and *version* *example: article_id : 5 // version 1 aricle_id: 5 // version 2 article_id: 6 // version 1* What i want to do is to retrieve the latest version for each article id (in my example i want to retrieve the article 5 version 2 object and article 6 and version 1 object). The problem is that mysql is doing the groupBy instead of the OrderBy so it returns to me the FIRST version of each article, but i want the opposit. Do you have an idea please ?

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