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  • how to get particular column distinct in linq to sql

    - by kart
    Hi All, Am having columns as category and songs in my table for each category there are almost 10 songs and in total there are 7 category such that which was tabled as category1 songCategory1a category1 songCategory1b category1 songCategory1c --- category2 songCategory2a category2 songCategory2b category2 songCategory2c --- category3 songCategory3a category3 songCategory3b category3 songCategory3c --- like that there is table in that i want to get the result as category1 category2 category3 category4 kindly any one help me , i tried (from s in _context.db_songs select new { s.Song_Name, s.Song_Category }).Distinct().ToList(); but it didnt work its resulting as such.

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  • need an sql query

    - by CKeven
    I currently have two tables: 1. car(plate_number, brand, cid) 2. borrow(StartDate, endDate, brand, id) I want to write a query to get all available brand and count of available cars for each brand

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  • What's the difference between these SQL conditions?

    - by wesley luan
    Select * from Example where 1 = Case when :index = 0 then Case when DateEx Between :pDat1 and :pDate2 then 1 end else Case When :index = 1 or :index = 2 then Case When DateEx >= :pDat1 then 1 end end end And Select * from Example where 1 = Case when :index = 0 then Case when DateEx Between :pDat1 and :pDat2 then 1 end else 1 end and 1 = Case When :index = 1 or :index = 2 then Case When DateEx >= :pDat1 then 1 end end

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  • SQL - get the article title with the last comment date

    - by stacker
    I have articles table, article_comments. I want to get the value: last_modified_all of article. I need this value to be the great date of this two: the last_modified field of articles table. the last comment of article_comments last_modified column. Can someone help me? the structure is very simple, and you can guess is without problem.

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  • SQL: count days in date range?

    - by John Isaacks
    I have a query like this: SELECT COUNT(*) AS amount FROM daily_individual_tracking WHERE sales = 'YES' AND daily_individual_tracking_date BETWEEN '2010-01-01' AND '2010-03-31' I am selected from a date range. Is there a way to also get the total days in the date range?

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  • SQL Server Querying An XML Field

    - by Gavin Draper
    I have a table that contains some meta data in an XML field. For example <Meta> <From>[email protected]</From> <To> <Address>[email protected]</Address> <Address>[email protected]</Address> </To> <Subject>ESubject Goes Here</Subject> </Meta> I want to then be able to query this field to return the following results From To Subject [email protected] [email protected] Subject Goes Here [email protected] [email protected] Subject Goes Here I've written the following query SELECT MetaData.query('data(/Meta/From)') AS [From], MetaData.query('data(/Meta/To/Address)') AS [To], MetaData.query('data(/Meta/Subject)') AS [Subject] FROM Documents However this only returns one record for that XML field. It combines both the 2 addresses into one result. Is it possible for split these on to separate records? The result I'm getting is From To Subject [email protected] [email protected] [email protected] Subject Goes Here Thanks Gav

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  • T-SQL: if exists always return true ?

    - by msfanboy
    Hello, What do you think , does the Stored Procedure always return 1 ? I am concerned about the if exists(..) BEGIN DECLARE @IsUserExisting bit SET NOCOUNT ON IF Exists ( Select null FROM G_User WHERE SamAccountName = @SamAccountName AND NetBIOSDomainName = @NetBIOSDomainName ) BEGIN SET @IsUserExisting = 1 END ELSE BEGIN SET @IsUserExisting = 0 END Select @IsUserExisting END

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  • Alter stored procedure if condition is met

    - by Matt
    I am looking to alter a stored procedure if a condition exists. I want to leave the stored procedure as is if the condition is not met, so drop/create is not really an option. Trying to put the contents of ALTER PROC inside an IF block is throwing up errors for me. Any thoughts?

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  • SQL return error within PHP

    - by Luke
    I use GET to get the id of a result. $id = $_GET['id']; I then use the following code: <? $q = $database->friendlyDetails($id); while( $row=mysql_fetch_assoc($q) ) { $hu = $row['home_user']; $ht = $row['home_team']; $hs = $row['home_score']; $au = $row['away_user']; $at = $row['away_team']; $as = $row['away_score']; $game = $row['game']; $name = $row['name']; $match = $row['match_report1']; $compid = $row['compid']; $date = $row['date_submitted']; $sub = $row['user_submitted']; } ?> And friendDetails- function friendlyDetails($i) { $q = "SELECT * FROM ".TBL_SUB_RESULTS." INNER JOIN ".TBL_FRIENDLY." ON ".TBL_FRIENDLY.".id = ".TBL_SUB_RESULTS.".compid WHERE ".TBL_SUB_RESULTS.".id = '$i'"; return mysql_query($q, $this->connection); } For some reason, the code will only return what is under id =1. Can anyone see anything obvious I am doing wrong?

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  • ignore some values in insert into select from sql stament

    - by nitroxn
    Suppose that I have a Table Symbols(Symbol, Value) and a Table SymbolValues (Symbol, Value) which contains a list of values for the symbol. How to choose maximum values fromt he SymbolValues table and insert into Symbols table. For Example, The SymbolValues Table has following values A 1 A 2 A 3 B 6 B 7 Then only A 3 and B 7 should be inserted in the Symbols table. Is this possible using insert into select statement. Thanks

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  • LINQ to SQL left outer joins

    - by César
    Is this query equivalent to a LEFT OUTER join? var rows = from a in query join s in context.ViewSiteinAdvise on a.Id equals s.SiteInAdviseId where a.Order == s.Order select new {....}; I tried this but it did not result from s in ViewSiteinAdvise join q in query on s.SiteInAdviseId equals q.Id into sa from a in sa.DefaultIfEmpty() where s.Order == a.Order select new {s,a} I need all columns from View

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  • Is there a command to test an SQL query without executing it? ( MySQL or ANSI SQL )

    - by Petruza
    Is there anything like this: TEST DELETE FROM user WHERE somekey = 45; That can return any errors, for example that somekey doesn't exist, or some constraint violation or anything, and reporting how many rows would be affected, but not executing the query? I know you can easily turn any query in a select query that has no write or delete effect in any row, but that can lead to errors and it's not very practical if you want to test and debug many queries.

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  • How I can move table to another filegroup ?

    - by denisioru
    Hello, I have MSSQL 2008 Ent and OLTP database with two big tables. How I can move this tables to another filegroup without service interrupting? Now, about 100-130 records inserted and 30-50 records updated each second in this tables. Each table have about 100M records and six fields (including one field geography). I looking for solution via google, but all solutions contain "create second table, insert rows from first table, drop first table, bla bla bla". Can I use partitioning functions for solving this problem? Thank you.

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  • Reset SQL variable inside SELECT statement

    - by Jason McCreary
    I am trying to number some rows on a bridge table with a single UPDATE/SELECT statement using a counter variable @row. For example: UPDATE teamrank JOIN (SELECT @row := @row + 1 AS position, name FROM members) USING(teamID, memberID) SET rank = position Is something like this possible or do I need to create a cursor? If it helps, I am using MySQL 5.

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  • Sql Server as logging, best connection practise

    - by ozz
    I'm using SqlServer as logging. Yes this is wrong decision, there are better dbs for this requirement. But I have no other option for now. Logging interval is 3 logs per second. So I've static Logger class and it has static Log method. Using "Open Connection" as static member is better for performance. But what is the best implemantation of it? This is not that I know. public static class OzzLogger { static SqlConnection Con; static OzzLogger() { Con=ne SqlConnection(....); Con.Open(); } public static void Log(....) { Con.ExecuteSql(......); } } UPDATE I asked because of my old information. People say "connection pooling performance is enough". If there is no objection I'm closing the issue :)

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  • How can I improve my select query for storing large versioned data sets?

    - by Jason Francis
    At work, we build large multi-page web applications, consisting mostly of radio and check boxes. The primary purpose of each application is to gather data, but as users return to a page they have previously visited, we report back to them their previous responses. Worst-case scenario, we might have up to 900 distinct variables and around 1.5 million users. For several reasons, it makes sense to use an insert-only approach to storing the data (as opposed to update-in-place) so that we can capture historical data about repeated interactions with variables. The net result is that we might have several responses per user per variable. Our table to collect the responses looks something like this: CREATE TABLE [dbo].[results]( [id] [bigint] IDENTITY(1,1) NOT NULL, [userid] [int] NULL, [variable] [varchar](8) NULL, [value] [tinyint] NULL, [submitted] [smalldatetime] NULL) Where id serves as the primary key. Virtually every request results in a series of insert statements (one per variable submitted), and then we run a select to produce previous responses for the next page (something like this): SELECT t.id, t.variable, t.value FROM results t WITH (NOLOCK) WHERE t.userid = '2111846' AND (t.variable='internat' OR t.variable='veteran' OR t.variable='athlete') AND t.id IN (SELECT MAX(id) AS id FROM results WITH (NOLOCK) WHERE userid = '2111846' AND (t.variable='internat' OR t.variable='veteran' OR t.variable='athlete') GROUP BY variable) Which, in this case, would return the most recent responses for the variables "internat", "veteran", and "athlete" for user 2111846. We have followed the advice of the database tuning tools in indexing the tables, and against our data, this is the best-performing version of the select query that we have been able to come up with. Even so, there seems to be significant performance degradation as the table approaches 1 million records (and we might have about 150x that). We have a fairly-elegant solution in place for sharding the data across multiple tables which has been working quite well, but I am open for any advice about how I might construct a better version of the select query. We use this structure frequently for storing lots of independent data points, and we like the benefits it provides. So the question is, how can I improve the performance of the select query? I assume the nested select statement is a bad idea, but I have yet to find an alternative that performs as well. Thanks in advance. NB: Since we emphasize creating over reading in this case, and since we never update in place, there doesn't seem to be any penalty (and some advantage) for using the NOLOCK directive in this case.

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  • Help with optimising SQL query

    - by user566013
    Hi i need some help with this problem. I am working web application and for database i am using sqlite. Can someone help me with one query from databse which must be optimized == fast =) I have table x: ID | ID_DISH | ID_INGREDIENT 1 | 1 | 2 2 | 1 | 3 3 | 1 | 8 4 | 1 | 12 5 | 2 | 13 6 | 2 | 5 7 | 2 | 3 8 | 3 | 5 9 | 3 | 8 10| 3 | 2 .... ID_DISH is id of different dishes, ID_INGREDIENT is ingredient which dish is made of: so in my case dish with id 1 is made with ingredients with ids 2,3 In this table a have more then 15000 rows and my question is: i need query which will fetch rows where i can find ids of dishes ordered by count of ingreedients ASC which i haven added to my algoritem. examle: foo(2,4) will rows in this order: ID_DISH | count(stillMissing) 10 | 2 1 | 3 Dish with id 10 has ingredients with id 2 and 4 and hasn't got 2 more, then is

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  • Comments Parent-Child query with indentation

    - by poldoj
    I've been trying to retrieve comments to articles in a pretty common blog fashion way. Here's my sample code: -- ---------------------------- -- Sample Table structure for [dbo].[Comments] -- ---------------------------- CREATE TABLE [dbo].[Comments] ( [CommentID] int NOT NULL , [AddedDate] datetime NOT NULL , [AddedBy] nvarchar(256) NOT NULL , [ArticleID] int NOT NULL , [Body] nvarchar(4000) NOT NULL , [parentCommentID] int NULL ) GO -- ---------------------------- -- Sample Records of Comments -- ---------------------------- INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'1', N'2011-11-26 23:18:07.000', N'user', N'1', N'body', null); GO INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'2', N'2011-11-26 23:18:50.000', N'user', N'2', N'body', null); GO INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'3', N'2011-11-26 23:19:09.000', N'user', N'1', N'body', null); GO INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'4', N'2011-11-26 23:19:46.000', N'user', N'3', N'body', null); GO INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'5', N'2011-11-26 23:20:16.000', N'user', N'1', N'body', N'1'); GO INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'6', N'2011-11-26 23:20:42.000', N'user', N'1', N'body', N'1'); GO INSERT INTO [dbo].[Comments] ([CommentID], [AddedDate], [AddedBy], [ArticleID], [Body], [parentCommentID]) VALUES (N'7', N'2011-11-26 23:21:25.000', N'user', N'1', N'body', N'6'); GO -- ---------------------------- -- Indexes structure for table Comments -- ---------------------------- -- ---------------------------- -- Primary Key structure for table [dbo].[Comments] -- ---------------------------- ALTER TABLE [dbo].[Comments] ADD PRIMARY KEY ([CommentID]) GO -- ---------------------------- -- Foreign Key structure for table [dbo].[Comments] -- ---------------------------- ALTER TABLE [dbo].[Comments] ADD FOREIGN KEY ([parentCommentID]) REFERENCES [dbo]. [Comments] ([CommentID]) ON DELETE NO ACTION ON UPDATE NO ACTION GO I thought I could use a CTE query to do the job like this: WITH CommentsCTE(CommentID, AddedDate, AddedBy, ArticleID, Body, parentCommentID, lvl, sortcol) AS ( SELECT CommentID, AddedDate, AddedBy, ArticleID, Body, parentCommentID, 0, cast(CommentID as varbinary(max)) FROM Comments UNION ALL SELECT P.CommentID, P.AddedDate, P.AddedBy, P.ArticleID, P.Body, P.parentCommentID, PP.lvl+1, CAST(sortcol + CAST(P.CommentID AS BINARY(4)) AS VARBINARY(max)) FROM Comments AS P JOIN CommentsCTE AS PP ON P.parentCommentID = PP.CommentID ) SELECT REPLICATE('--', lvl) + right('>',lvl)+ AddedBy + ' :: ' + Body, CommentID, parentCommentID, lvl FROM CommentsCTE WHERE ArticleID = 1 order by sortcol go but the results have been very disappointing so far, and after days of tweaking I decided to ask for help. I was looking for a method to display hierarchical comments to articles like it happens in blogs. [edit] The problem with this query is that I get duplicates because I couldn't figure out how to properly select the ArticleID which I want comments from to display. I'm also looking for a method that sorts children entries by date within a same level. An example of what I'm trying to accomplish could be something like: (ArticleID[post retrieved]) ------------------------- ------------------------- (Comments[related to the article id above]) first comment[no parent] --[first child to first comment] --[second child to first comment] ----[first child to second child comment to first comment] --[third child to first comment] ----[first child to third child comment to first comment] ------[(recursive child): first child to first child to third child comment to first comment] ------[(recursive child): second child to first child to third child comment to first comment] second comment[no parent] third comment[no parent] --[first child to third comment] I kinda got myself lost in all this mess...I appreciate any help or simpler ways to get this working. Thanks

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  • Stored procedure and trigger

    - by noober
    Hello all, I had a task -- to create update trigger, that works on real table data change (not just update with the same values). For that purpose I had created copy table then began to compare updated rows with the old copied ones. When trigger completes, it's neccessary to actualize the copy: UPDATE CopyTable SET id = s.id, -- many, many fields FROM MainTable s WHERE s.id IN (SELECT [id] FROM INSERTED) AND CopyTable.id = s.id; I don't like to have this ugly code in trigger anymore, so I has extracted it to a stored procedure: CREATE PROCEDURE UpdateCopy AS BEGIN UPDATE CopyTable SET id = s.id, -- many, many fields FROM MainTable s WHERE s.id IN (SELECT [id] FROM INSERTED) AND CopyTable.id = s.id; END The result is -- Invalid object name 'INSERTED'. How can I workaround this? Regards,

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  • Selecting the 2nd row in sql

    - by Alex Chen
    I want to select the second row only from the table. From the ClientUserName column. SELECT ClientUserName, DestHost, count(DestHost) counts FROM #ProxyLog_record WHERE ClientUserName = (Select top 1 ClientUserName from #ProxyLog_count_2) GROUP BY ClientUserName, DestHost ORDER BY counts DESC The (Select top 1 ClientUserName from #ProxyLog_count_2) shows top 1 only but I need to get the 2nd data from that table. How can I do this?

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