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• SQL complex Question

  - by santanu

  Hello All, I need to find a function. the scenario is : I have 2 table. 1. news table 2. news_comment table need to find the most commented 20 news. the news_comment table has the relationship with the news table Thank you

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• How to change the primary key to be non-clustered?

  - by AngryHacker

  Part-time reluctant DBA here. I want to change an existing primary key index from clustered to non-clustered. And the syntax is escaping me. This is how it's scripted out right now. ALTER TABLE [dbo].[Config] WITH NOCHECK ADD CONSTRAINT [PK_Config] PRIMARY KEY CLUSTERED ( [ConfigID] ) ON [PRIMARY] I am not seeing an ALTER CONSTRAINT statement in the online docs.

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• How would I do this in SQL?

  - by bergyman

  Let's say I have the following tables: PartyRelationship EffectiveDatedAttributes PartyRelationship contains a varchar column called class. EffectiveDatedAttributes contains a foreign key to PartyRelationship called ProductAuthorization. If I run this: select unique eda.productauthorization from effectivedatedattributes eda inner join partyrelationship pr on eda.productauthorization = pr.ID where pr.class = 'com.pmc.model.bind.ProductAuthorization' it returns a list of ProductAuthorization IDs. I need to take this list of IDs and insert a new row into EffectiveDatedAttributes for every ID, containing the ID as well as some other data. How would I iterate over the returned IDs from the previous select statement in order to do this?

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• Set Linq To Sql Binary field to null

  - by Karsten

  Trying to set a Binary field to null gives me an ArgumentNull exception. I can set the field to be empty like this new Binary(new byte[] {}); but that's not null just an empty column. Is there a workaround using LinqToSql ?

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• LINQ to SQL: To Attach or Not To Attach

  - by bradhe

  So I'm have a really hard time figuring out when I should be attaching to an object and when I shouldn't be attaching to an object. First thing's first, here is a small diagram of my (very simplified) object model. Edit: Okay, apparently I'm not allowed to post images...here you go: http://i.imgur.com/2ROFI.png In my DAL I create a new DataContext every time I do a data-related operation. Say, for instance, I want to save a new user. In my business layer I create a new user. var user = new User(); user.FirstName = "Bob"; user.LastName = "Smith"; user.Username = "bob.smith"; user.Password = StringUtilities.EncodePassword("MyPassword123"); user.Organization = someOrganization; // Assume that someOrganization was loaded and it's data context has been garbage collected. Now I want to go save this user. var userRepository = new RepositoryFactory.GetRepository<UserRepository>(); userRepository.Save(user); Neato! Here is my save logic: public void Save(User user) { if (!DataContext.Users.Contains(user)) { user.Id = Guid.NewGuid(); user.CreatedDate = DateTime.Now; user.Disabled = false; //DataContext.Organizations.Attach(user.Organization); DataContext.Users.InsertOnSubmit(user); } else { DataContext.Users.Attach(user); } DataContext.SubmitChanges(); // Finished here as well. user.Detach(); } So, here we are. You'll notice that I comment out the bit where the DataContext attachs to the organization. If I attach to the organization I get the following exception: NotSupportedException: An attempt has been made to Attach or Add an entity that is not new, perhaps having been loaded from another DataContext. This is not supported. Hmm, that doesn't work. Let me try it without attaching (i.e. comment out that line about attaching to the organization). DuplicateKeyException: Cannot add an entity with a key that is already in use. WHAAAAT? I can only assume this is trying to insert a new organization which is obviously false. So, what's the deal guys? What should I do? What is the proper approach? It seems like L2S makes this quite a bit harder than it should be...

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• SQL Query to retrieve highest item up to a point in a group

  - by James

  The best way of describing this is I have a table of people with their names and ages. Assume that people with the same surname are from the same family. I need a query in oracle which will retrieve a list of the oldest person in each family, but not older than a certain age. Table: person name surname age =============================== James Smith 23 Sarah Powell 17 Barry Smith 31 Mark Smith 35 Mary Smith 18 Bob Powell 30 How do I retrieve the oldest person in each family under 30? Results I'm after name surname age =============================== James Smith 23 Sarah Powell 17

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• Linq-to-sql Compiled Query is returning result from different DataContext

  - by Vladimir Kojic

  Compiled query: public static Func<OperationalDataContext, short, Machine> QueryMachineById = CompiledQuery.Compile((OperationalDataContext db, short machineID) => db.Machines.Where(m => m.MachineID == machineID).SingleOrDefault()); It looks like compiled query is caching Machine object and returning the same object even if query is called from new DataContext (I’m disposing DataContext in the service but I’m getting Machine from previous DataContext). I use POCOs and XML mapping. Revised: It looks like compiled query is returning result from new data context and it is not using the one that I passed in compiled-query. Therefore I can not reuse returned object and link it to another object obtained from datacontext thru non compiled queries. I’m using unit of work pattern : // First Call Using(new DataContext) { Machine from DataContext.Table == machine from cached query } // Do some work // Second Call is failing Using(new DataContext) { Machine from DataContext.Table <> machine from cached query }

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• SQL-Calculate percentages from database table values

  - by Howard

  Hi, Im trying to calculate the percentages of selected fields from tables. Within the fields that data is numeric but I want to show the percentage value. Please help. private void btnpics_Click(object sender, EventArgs e) { try { myCon.Open(); string queryString = "SELECT FoodType.Description,FoodType.Calories, FoodType.Carbohydrate, FoodType.Fat, FoodType.Protein FROM [FoodType], [Meal] WHERE (Meal.UserID =" + userid.Text + ") AND (Meal.MealDate =" + date.Text + ");"; MessageBox.Show(queryString); loadDataGrid(queryString); } catch (Exception ex) { MessageBox.Show(ex.Message); } }

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• choosing row (from group) with max value in a SQL Server Database

  - by sriehl

  I have a large database and am putting together a report of the data. I have aggregated and summed the data from many tables to get two tables that look like the following. id | code | value id | code | value 13 | AA | 0.5 13 | AC | 2.0 13 | AB | 1.0 14 | AB | 1.5 14 | AA | 2.0 13 | AA | 0.5 15 | AB | 0.5 15 | AB | 3.0 15 | AD | 1.5 15 | AA | 1.0 I need to get a list of id's, with the code (sumed from both tables) with the largest value. 13 | AC 14 | AA 15 | AB There are 4-6 thousand records and it is not possible to change the original tables. I'm not too worried about performance as I only need to run it a few times a year. edit: Let me see if I can explain a bit more clearly, imagine the id is the customer id, the code is who they ordered from and the value is how much they spent there. I need a list of the all the customer id's and the store that customer spent the most money at (and if they spent the same at two different stores, put a value such as 'ZZ' in for the store name).

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• SQL 2003 Distance Latitude Longitude

  - by J.Hendrix

  I have a table full of Dealers along with their latitude and longitude. I am trying to determine the top n closest dealers to any given lat and lon. I already have the function to calculate distance between locations, but I want to do as few calculations as possible (my table can contain many thousands of entries). Currently I have to calculate the distance for each entry then sort them. Is there any way to sort before I do the calculation to improve performance? This question is good, but I will not always know my range. Should I just pick an arbitrarily high range then refine my results? I am thankful for any help the community can offer. declare @Lat real declare @lon real Set @lat = 41.05 Set @lon = -73.53 SELECT top 10 MemberID, Address1, City, State, Zip, Phone, Lat, Lon, (SELECT fun_DistanceLatLon] (@Lat,@lon,Lat,Lon)) as mDistance --Calculate distance FROM Dealers Order by (SELECT fun_DistanceLatLon] (@Lat,@lon,Lat,Lon))

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• SQL: Daily Average of Logins Per Hour

  - by jerrygarciuh

  This query is producing counts of logins per hour: SELECT DATEADD(hour, DATEDIFF(hour, 0, EVENT_DATETIME), 0), COUNT(*) FROM EVENTS_ALL_RPT_V1 WHERE EVENT_NAME = 'Login' AND EVENT_DATETIME >= CONVERT(DATETIME, '2010-03-17 00:00:00', 120) AND EVENT_DATETIME <= CONVERT(DATETIME, '2010-03-24 00:00:00', 120) GROUP BY DATEADD(hour, DATEDIFF(hour, 0, EVENT_DATETIME), 0) ORDER BY DATEADD(hour, DATEDIFF(hour, 0, EVENT_DATETIME), 0) ...with lots of results like this: Datetime COUNT(*) ---------------------------------- 2010-03-17 12:00:00.000 135 2010-03-17 13:00:00.000 129 2010-03-17 14:00:00.000 147 What I need to figure out is how to query the average logins per hour for a given day. Any help?

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• sql sum data from multiple tables

  - by Iulian

  I have 2 tables AP and INV where both have the columns [PROJECT] and [Value]. I want a query to return something like this : PROJECT | SUM_AP | SUM_INV I came up with the code below but it's returning the wrong results ( sum is wrong ). SELECT SUM(AP.Value) AS SUM_AP, SUM(INV.Value) AS SUM_INV FROM AP INNER JOIN INV ON (AP.[PROJECT] =INV.[PROJECT]) WHERE AP.[PROJECT] = 'XXXXX' GROUP BY AP.[PROJECT]

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• Query design in SQL - ORDER BY SUM() of field in rows which meet a certain condition

  - by Christian Mann

  OK, so I have two tables I'm working with - project and service, simplified thus: project ------- id PK name str service ------- project_id FK for project time_start int (timestamp) time_stop int (timestamp) One-to-Many relationship. Now, I want to return (preferably with one query) a list of an arbitrary number of projects, sorted by the total amount of time spent at them, which is found by SUM(time_stop) - SUM(time_start) WHERE project_id = something. So far, I have SELECT project.name FROM service LEFT JOIN project ON project.id = service.project_id LIMIT 100 but I cannot figure out how what to ORDER BY.

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• LINQ to SQL - Tracking New / Dirty Objects

  - by Joseph Sturtevant

  Is there a way to determine if a LINQ object has not yet been inserted in the database (new) or has been changed since the last update (dirty)? I plan on binding my UI to LINQ objects (using WPF) and need it to behave differently depending whether or not the object is already in the database. MyDataContext context = new MyDataContext(); MyObject obj; if (new Random().NextDouble() > .5) obj = new MyObject(); else obj = context.MyObjects.First(); // How can I distinguish these two cases? The only simple solution I can think of is to set the primary key of new records to a negative value (my PKs are an identity field and will therefore be set to a positive integer on INSERT). This will only work for detecting new records. It also requires identity PKs, and requires control of the code creating the new object. Is there a better way to do this? It seems like LINQ must be internally tracking the status of these objects so that it can know what to do on context.SubmitChanges(). Is there some way to access that "object status"? Clarification Apparently my initial question was confusing. I'm not looking for a way to insert or update records. I'm looking for a way, given any LINQ object, to determine if that object has not been inserted (new) or has been changed since its last update (dirty).

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• SQL Server 2008 Geography .STBuffer() distance measurement units

  - by Chris

  I'm working with a geographic point using lat/long and need to find other points in our database within a 5 mile radius of that point. However, I can't seem to find out what the "units" are for STBuffer, it doesn't seem to conform to feet, miles, meters, kilometers, etc. The documentation only refers to them as "units", any suggestions? Thanks [...] from geography::STGeomFromText('POINT(x y)', 4326).STBuffer(z).STIntersects(geography::STGeomFromText('POINT(' + CAST(v.Longitude as varchar(max)) + ' ' + CAST(v.Latitude as varchar(max)) + ')', 4326)) = 1

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• Make SQL Select same row multiple times

  - by Emre

  I need to test my mail server. How can I make a Select statement that selects say ID=5469 a thousand times.

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• Using SQL Server Intergration Services (SSIS) can you read a file from a FileStream column in SQL Se

  - by tbrovold

  I am trying to create a tool that I can upload different types of files "csv", Excel, XML and load those files into a FileStream column in the database as "Source" untouched over the web. Then using SSIS on the server I want to create a package that will process that file to be loaded into other tables to be used by the web application. Is it possible to have SSIS read a file from FileStream column? if so how?

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• SSIS Data Flow Task SQL 2008

  - by Gerard

  Hi All, I am wondering if it is possible to: 1) Develop SSIS Package for Data Flow Task I am aware of how to do this on a local or network SQLServer, However is it possible to create a package that uploads to a "remote" sqlserver, ie one that is not on site or on the LAN. any guidance would be great Thanks

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• SQL server virtual memory usage and performance

  - by user365035

  Hello, I have a very large DB used mostly for analytics. The performance overall is very sluggish. I just noticed that when running the query below, the amount of virtual memory used greatly exceeds the amount of physical memory available. Currently, physical memory is 10GB (10238k bytes) whereas the virtual memory returns significantly more - 8388607k bytes. That seems really wrong, but I'm at a bit of a loss on how to proceed. USE [master]; GO select cpu_count , hyperthread_ratio , physical_memory_in_bytes / 1048576 as 'mem_MB' , virtual_memory_in_bytes / 1048576 as 'virtual_mem_MB' , max_workers_count , os_error_mode , os_priority_class from sys.dm_os_sys_info

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• SQL Logic Operator Precedence: And and Or

  - by nc

  Are the two statements below equivalent? SELECT [...] FROM [...] WHERE some_col in (1,2,3,4,5) AND some_other_expr and SELECT [...] FROM [...] WHERE some_col in (1,2,3) or some_col in (4,5) AND some_other_expr Is there some sort of truth table I could use to verify this? Thanks.

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• C# LINQ to SQL Except Operator

  - by kb

  Hi i have a list of event Ids that i want to be excluded from my select statement, but no sure how to implement this: this is what stores my list of event Ids List<int> ExcludedEvents; and this is my select statement (from an XML feed) var allEvents = from eventsList in xmlDoc.Elements("shows").Elements("Show") select new EventFeed() { EventName = eventsList.Attribute("Name").Value, EventSummary = eventsList.Attribute("ShortDesc").Value, EventDetails = eventsList.Attribute("LongDesc").Value, EventShowCode = eventsList.Attribute("Code").Value }; i want to select all events except for the events that have their eventId matching the EventShowCode value i have looked at the except operator, but not sure how to implement it thanks

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• SQL Query - Count column values separately

  - by user575535

  I have a hard time getting a Query to work right. This is the DDL for my Tables CREATE TABLE Agency ( id SERIAL not null, city VARCHAR(200) not null, PRIMARY KEY(id) ); CREATE TABLE Customer ( id SERIAL not null, fullname VARCHAR(200) not null, status VARCHAR(15) not null CHECK(status IN ('new','regular','gold')), agencyID INTEGER not null REFERENCES Agency(id), PRIMARY KEY(id) ); Sample Data from the Tables AGENCY id|'city' 1 |'London' 2 |'Moscow' 3 |'Beijing' CUSTOMER id|'fullname' |'status' |agencyid 1 |'Michael Smith' |'new' |1 2 |'John Doe' |'regular'|1 3 |'Vlad Atanasov' |'new' |2 4 |'Vasili Karasev'|'regular'|2 5 |'Elena Miskova' |'gold' |2 6 |'Kim Yin Lu' |'new' |3 7 |'Hu Jintao' |'regular'|3 8 |'Wen Jiabao' |'regular'|3 I want to produce the following output, but i need to count separately for ('new','regular','gold') 'city' |new_customers|regular_customers|gold_customers 'Moscow' |1 |1 |1 'Beijing'|1 |2 |0 'London' |1 |1 |0

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• Using SQL to calculate a date within a certain date range

  - by David Passmore

  Hi, I'm using access 2007 and i am trying to set up a database to act as a library system, i need a function that automatically calculates a date 14 days after a given date i.e. Loan Date vs. Due Date. But the library is open only on certain Days. So i need the 14 days not to include the dates that are out of hours, like weekends and school holidays etc. I think i need to use Select Case or IIF's? Help would be appreciated! Thanks David

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• Standards for Encrypting data in SOX/HIPAA in SQL Server 200x

  - by Greens

  I was wondering if there are any standards for encrypting sensitive data in Database which are compliant w/ SOX or HIPAA. Or does the Encrypt Function in SQLServer necessary?. or handle in Business logic. Any ideas or links we have.

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• Formula parsing / evaluation routine or library with generic DLookup functionality

  - by tbone

  I am writing a .Net application where I must support user-defined formulas that can perform basic mathematics, as well as accessing data from any arbitrary table in the database. I have the math part working, using JScript Eval(). What I haven't decided on is what a nice way is to do the generic table lookups. For example, I may have a formula something like: Column: BonusAmount Formula: {CurrentSalary} * 1.5 * {[SystemSettings][Value][SettingName=CorpBonus AND Year={Year}]} So, in this example I would replace {xxx} and {Year} with the value of Column xxx from the current table, and I would replace the second part with the value of (select Value from SystemSettings WHERE SettingName='CorpBonus' AND Year=2008) So, basically, I am looking for something very much like the MS Access DLookup function: DLookup ( expression, domain, [criteria] ) DLookup("[UnitPrice]", "Order Details", "OrderID = 10248") But, I also need to overall parsing routine that can tell whether to just look up in the current row, or to look into another table. Would also be nice to support aggregate functions (ie: DAvg, DMax, etc), as well as all the weird edge cases handled. So I wonder if anyone knows of any sort of an existing library, or has a nice routine that can handle this formula parsing and database lookup / aggregate function resolution requirements.

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