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• SQL Server CLR Integration to acheive Encryption/Decryption

  - by Aakash

  I have a requirement to store the data in encrypted form in database tables. I want to do it at database level but the problems I am facing: ( a) Data Type of the field should be Varbinary. ( b) Encryption is not supported by Workgroup edition ( c) Is it possible to encrypt Numeric Fields? I want to access the encrypted data in tables to fetch in views and stored procedure for some processing but due to above problems I am not able to. Here is my Environment: Development Platform - ASP.Net,.Net Framework 3.5,Visual studio 2008 Server Operating System - Windows Server 2008 Database - SQL Server 2008 Work group edition I was also thinking to adopt a different approach to resolve this issue (yet to test it's feasibility). I was just wondering if I could create a CLR function (which could take parameters to encrypt and decrypt data using Cryptography types provided in .Net framework) and use the CLR integration feature of SQL Server and call that function from stored procedure and views. I am not sure if I am thinking in right direction? Any advice on this as well please.

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• Debugging stored procedures, without using SSMS 2008 Debugger, or the Visual Studio debugger (output

  - by Albert

  I have a SQL Server 2005 database with some Stored Procedures (SP) that I would like to debug...essentially I would just like to check variable values at certain points throughout the SP execution. I have SSMS 2008, but when I try to use the debugger, I get an error that it can't debug SQL Server 2005 databases. And I can't use the Visual Studio debugger (by stepping into the SP via Server Explorer) because Remote Debugging is blocked by our firewall, and I'm rightfully not allowed to touch the firewall. So my question is how can I check variable values at certain points in the SP execution? Is there some way to output those values somewhere, perhaps along with some text?

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• SQL Server 2005/2008: Identify current user

  - by Torben H.

  Hello I have a web application, which is using a SQL Server 2005 database. My problem is, that the application has no role management. So the application always accesses the database with one default user. But now I have to save and access a value only for the current user. Is there any way to do this? Maybe something like a session on the web server? The best way would be, if there is any possibility to access the current session id of the web server from T-SQL. Do anyone understand my problem? :) Torben

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• T-SQL How To: Compare and List Duplicate Entries in a Table

  - by Dan7el

  SQL Server 2000. Single table has a list of users that includes a unique user ID and a non-unique user name. I want to search the table and list out any users that share the same non-unique user name. For example, my table looks like this: ID User Name Name == ========= ==== 0 parker Peter Parker 1 parker Mary Jane Parker 2 heroman Joseph (Joey) Carter Jones 3 thehulk Bruce Banner What I want to do is do a SELECT and have the result set be: ID User Name Name == ========= ==== 0 parker Peter Parker 1 parker Mary Jane Parker from my table. I'm not a T-SQL guru. I can do the basic joins and such, but I'm thinking there must be an elegant way of doing this. Barring elegance, there must be ANY way of doing this. I appreciate any methods that you can help me with on this topic. Thanks! ---Dan---

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• SQL Server 2008 Management Studio doesn't recognize new Schema

  - by Lieven Cardoen

  I have created a new Schema in a database called Contexts. Now when I want to write a query, Management Studio doesn't recognize the tables that belong to the new Schema. It says: 'Invalid object name Contexts.ContextLibraries'... Transact-SQL: INSERT INTO [Contexts].[ContextLibraries] (ChannelId, [IsSystem]) VALUES (@ChannelId, 1) When I try the same thing on my local database, it does work... Any ideas? I did try to change the Default schema for the user from dbo to Contexts but this doesn't work. Also checked Contexts in Schemas owned by this user without success. Update: Apparently the sql query does work but the editor gives a fault saying the object is invalid.

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• sqlserver 2008 and sql CE over Microsoft sync framework

  - by malik

  The server will drop the connection, because the client driver has sent multiple requests while the session is in single-user mode. This error occurs when a client sends a request to reset the connection while there are batches still running in the session, or when the client sends a request while the session is resetting a connection. Please contact the client driver vendor. Synchronisation process some time work and mostly fails. I have 5 client of sql CE that need to sync and i am using WCF IIS and sql 2008 for this process.

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• SQL Server does not exist or access denied.

  - by KareemSaad

  SQL Server does not exist or access denied. I had this problem when browsing web site

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• Extracting data from multiple servers SQL 2005 SSIS

  - by Raj

  I have created an SSIS package to connect to multiple SQL servers, create a database, a table and a stored procedure. The package also creates a job and schedules it to run every 5 minutes. The requirement is to collect performance metrics. I am using an ado object variable to get the server names and all the above tasks are in a for each loop and everything works fine. Now the problem: I need to create a data flow task, which will connect to each of these servers in turn, copy the performance metrics data over to a central server and purge the source table. I am unable to get this task to work. This task fails with "Unable to obtain Connection" error. Any help will be greatly appreciated. SQL Server Version : 2005 Thanks, Raj

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• SQL Server Bulk Insert failing when called from .NET SqlCommand

  - by Nick Wright

  I have a stored procedure which does bulk insert on a SQL server 2005 database. When I call this stored procedure from some SQL (passing in the name of a local format file and data file) it works fine. Every time. However, when this same stored procedure gets called from C# .NET 3.5 code using SqlCommand.ExecuteNonQuery it works intermittently. When it fails a SqlException is generated stating "Cannot bulk load. Invalid column number in the format file "c:\bulkinsert\MyFile.fmt" I don't think this error message is correct. Has anyone experienced similar problems with calling bulk insert from code? Thanks.

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• Selecting the most common value from relation - SQL statement

  - by Ronnie

  I have a table within my database that has many records, some records share the same value for one of the columns. e.g. | id | name | software | ______________________________ | 1 | john | photoshop | | 2 | paul | photoshop | | 3 | gary | textmate | | 4 | ade | fireworks | | 5 | fred | textmate | | 6 | bob | photoshop | I would like to return the value of the most common occurring piece of software, by using an SQL statement. So in the example above the required SQL statement would return 'photoshop' as it occurs more than any other piece of software. Is this possible? Thank you for your time.

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• MS SQL 2005/2008: Identify current user

  - by Torben H.

  Hello I have a web application, which is using a MS SQL 2005 database. My problem is, that the application has no rolemanagement. So the application always accesses the database with one default user. But now I have to save and access a value only for the current user. Is there any way to do this? Maybe something like a session on the webserver? The best way would be, if there is any possibility to access the current session id of the webserver from T-SQL. Do anyone understand my problem? :) Torben

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• Microsoft SQL Server 2005 - using the modulo operator

  - by cc0

  So I have a silly problem, I have not used much SQL Server before, or any SQL for that matter. I basically have a minor mathematical problem that I need solved, and I thought modulo would be good. I have a number of dates in the database, but I need them be rounded off to the closest [dynamic integer] (could be anything from 0 to 5000000) which will be input as a parameter each time this query is called. So I thought I'd use modulo to find the remainder, then subtract that remainder from the date. If there is a better way, or an integrated function, please let me know! What would be the syntax for that? I've tried a lot of things, but I keep getting error messages like integers/floats/decimals can't be used with the modulo operators. I tried casting to all kinds of numeric datatypes. Any help would be appreciated.

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• Looking for SQL Server Performance Monitor Tools

  - by the-locster

  I may be approaching this problem from the wrong angle but what I'm thinking of is some kind of performance monitor tool for SQl server that works in a similar way to code performance tools, e.g. I;d like to see an output of how many times each stored procedure was called, average executuion time and possibly various resource usage stats such as cache/index utilisation, resultign disk access and table scans, etc. As far as I can tell the performance monitor that comes with SQL Server just logs the various calls but doesn't report he variosu stats I'm looking for. Potentially I just need a tool to analyze the log output?

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• T-Sql SPROC - Parse C# Datatable to XML in Database (SQL Server 2005)

  - by Goober

  Scenario I've got an application written in C# that needs to dump some data every minute to a database. Because its not me that has written the spec, I have been told to store the data as XML in the SQL Server database and NOT TO USE the "bulk upload" feature. Essentially I just wanted to have a single stored procedure that would take XML (that I would produce from my datatable) and insert it into the database.....and do this every minute. Current Situation I've heard about the use of "Sp_xml_preparedocument" but I'm struggling to understand most of the examples that I've seen (My XML is far narrower than my C Sharp ability). Question I would really appreciate someone either pointing me in the direction of a worthwhile tutorial or helping explain things. EDIT - Using (SQL Server 2005)

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• SQL-query task, decision?

  - by Sirius Lampochkin

  There is a table of currencies rates in MS SQL Server 2005: ID | CURR | RATE | DATE 1   | USD   | 30      | 01.10.2010 3   | GBP   | 45      | 07.10.2010 5   | USD   | 31      | 08.10.2010 7   | GBP   | 46      | 09.10.2010 9   | USD   | 32      | 12.10.2010 11 | GBP   | 48      | 03.10.2010 Rate are updated in real time and there are more than 1 billion rows in the table. It needs to write a SQL-query, wich will provide latest rates per each currency. My decision is: SELECT c.[id],c.[curr],c.[rate],c.[date] FROM [curr_rate] c, (SELECT curr, MAX(date) AS rate_date FROM [curr_rate] GROUP BY curr) t WHERE c.date = t.rate_date AND c.curr = t.curr ORDER BY c.[curr] ASC Is it possible to write a query without sub-queries and join's with derived tables?

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• Getting clusters of rows close together in time

  - by Mike

  I have a table basically like so ID | ItemID | Start | End | --------------------------------------------------------------- 1 234 10/20/09 8:34:22 10/20/09 8:35:10 2 274 10/20/09 8:35:30 10/20/09 8:36:27 3 272 10/21/09 12:15:00 10/21/09 12:17:00 4 112 10/21/09 12:20:14 10/21/09 12:21:21 5 15 10/21/09 12:22:39 10/21/09 12:24:15 There are two "clusters" of entries here, 1-2 and 3-5 separated by a gap in time, specifically 30 minutes is what I'm interested in. What I would like is the first and last rows of the cluster of entries. This is fairly easy to achieve by retrieving all the rows and looping through them in order of start time, but I'd like to have it in SQL if possible. I'm using SQL Server 2008, thanks.

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• INNER JOIN vs LEFT JOIN performance in SQL Server

  - by Ekkapop

  I've created SQL command that use INNER JOIN for 9 tables, anyway this command take a very long time (more than five minutes). So my folk suggest me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, at first time its despite what I know. After I changed, the speed of query is significantly improve. I want to know why LEFT JOIN is faster than INNER JOIN? My SQL command look like below: SELECT * FROM A INNER JOIN B ON ... INNER JOIN C ON ... INNER JOIN D and so no

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• SQL Server - Query Short-Circuiting?

  - by Sam Schutte

  Do T-SQL queries in SQL Server support short-circuiting? For instance, I have a situation where I have two database and I'm comparing data between the two tables to match and copy some info across. In one table, the "ID" field will always have leading zeros (such as "000000001234"), and in the other table, the ID field may or may not have leading zeros (might be "000000001234" or "1234"). So my query to match the two is something like: select * from table1 where table1.ID LIKE '%1234' To speed things up, I'm thinking of adding an OR before the like that just says: table1.ID = table2.ID to handle the case where both ID's have the padded zeros and are equal. Will doing so speed up the query by matching items on the "=" and not evaluating the LIKE for every single row (will it short circuit and skip the LIKE)?

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• Where clause in joins vs Where clause in Sub Query

  - by Kanavi

  DDL create table t ( id int Identity(1,1), nam varchar(100) ) create table t1 ( id int Identity(1,1), nam varchar(100) ) DML Insert into t( nam)values( 'a') Insert into t( nam)values( 'b') Insert into t( nam)values( 'c') Insert into t( nam)values( 'd') Insert into t( nam)values( 'e') Insert into t( nam)values( 'f') Insert into t1( nam)values( 'aa') Insert into t1( nam)values( 'bb') Insert into t1( nam)values( 'cc') Insert into t1( nam)values( 'dd') Insert into t1( nam)values( 'ee') Insert into t1( nam)values( 'ff') Query - 1 Select t.*, t1.* From t t Inner join t1 t1 on t.id = t1.id Where t.id = 1 Query 1 SQL profiler Result Reads = 56, Duration = 4 Query - 2 Select T1.*, K.* from ( Select id, nam from t Where id = 1 )K Inner Join t1 T1 on T1.id = K.id Query 2 SQL Profiler Results Reads = 262 and Duration = 2 You can also see my SQlFiddle Query - Which query should be used and why?

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• SQL Server: Check if table exists

  - by Vincent

  I would like this to be the ultimate discussion on how to check if a table exists in SQL Server 2000/2005 using SQL Statement. When you Google for the answer, you get so many different answers. Is there an official/backward & forward compatible way of doing it? Here are two ways to start discussion: IF EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE' AND TABLE_NAME='mytablename') SELECT 1 AS res ELSE SELECT 0 AS res; IF OBJECT_ID (N'".$table_name."', N'U') IS NOT NULL SELECT 1 AS res ELSE SELECT 0 AS res; MySQL provides a nice SHOW TABLES LIKE '%tablename%'; statement. I am looking for something similar.

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• Help Reading Binary Image Data from SQL Server into PHP

  - by Joe Majewski

  I cannot seem to figure out a way to read binary data from SQL server into PHP. I am working on a project where I need to be able to store the image directly in the SQL table, not on the file system. Currently, I have been using a query like this one: INSERT INTO myTable(Document) SELECT * FROM OPENROWSET(BULK N'C:\image.jpg', SINGLE_BLOB) as BLAH This works fine to actually insert the image into the table, but I haven't yet figured a way to retrieve it and get my image back. I am doing this with PHP, and ultimately will have to make a stored procedure out of it, but can anyone enlighten me on a way to get that binary data (varbinary(MAX)) and generate an image on the fly. I expected it to be simple to use a SELECT statement and add a content-type to the headers that indicated it was an image, but it's simply not working. Instead, the page will just display the name of the file, which I have encountered in the past and understand it to be an error with the image data.

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• Generate SQL Server Express database from Entity Framework 4 model

  - by Cranialsurge

  I am able to auto-generate a SQL Server CE 4.0 *.sdf file using code-first generation as explained by Scott Guthrie here. The connection string for the same is as follows: <add name="NerdDinners" providerName="System.Data.SqlServerCe.4.0" connectionString="data source=|DataDirectory|NerdDinner.sdf"/> However if I try to generate an mdf instead using the following connection string, it fails to do so with the following error - "The provider did not return a ProviderManifestToken string.". <add name="NerdDinners" providerName="System.Data.SqlClient" connectionString="data source=|DataDirectory|NerdDinner.mdf"/> Even directly hooking into a SQLEXPRESS instance using the following connection string fails <add name="NerdDinners" providerName="System.Data.SqlClient" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=NerdDinner;Integrated Security=True"/> Does EF 4 only support SQL CE 4.0 for database creation from a model for now or am I doing something wrong here?

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• Correct Way to Get Date Between Dates In SQL Server

  - by Chuck Haines

  I have a table in SQL server which has a DATETIME field called Date_Printed. I am trying to get all records in the table which lie between a specified date range. Currently I am using the following SQL DECLARE @StartDate DATETIME DECLARE @EndDate DATETIME SET @StartDate = '2010-01-01' SET @EndDate = '2010-06-18 12:59:59 PM' SELECT * FROM table WHERE Date_Printed BETWEEN @StartDate AND @EndDate I have an index on the Date_Printed column. I was wondering if this is the best way to get the rows in the table which lie between those date or if there is a faster way. The table has about 750,000 records in it right now and it will continue to grow. The query is pretty fast but I'd like to make it faster if possible.

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• Finding gaps (missing records) in database records using SQL

  - by Tony_Henrich

  I have a table with records for every consecutive hour. Each hour has some value. I want a T-SQL query to retrieve the missing records (missing hours, the gaps). So for the DDL below, I should get a record for missing hour 04/01/2010 02:00 AM (assuming date range is between the first and last record). Using SQL Server 2005. Prefer a set based query. DDL: CREATE TABLE [Readings]( [StartDate] [datetime] NOT NULL, [SomeValue] [int] NOT NULL ) INSERT INTO [Readings]([StartDate], [SomeValue]) SELECT '20100401 00:00:00.000', 2 UNION ALL SELECT '20100401 01:00:00.000', 3 UNION ALL SELECT '20100401 03:00:00.000', 45

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• Using multiple aggregate functions in an algebraic expression in (ANSI) SQL statement

  - by morpheous

  I have the following aggregate functions (AGG FUNCs): foo(), foobar(), fredstats(), barneystats(). I want to know if I can use multiple AGG FUNCs in an algebraic expression. This may seem a strange/simplistic question for seasoned SQL developers - however, the but the reason I ask is that so far, all AGG FUNCs examples I have seen are of the simplistic variety e.g. max(salary) < 100, rather than using the AGG FUNCs in an expression which involves using multiple AGG FUNCs in an expression (like agg_func1() agg_func2()). The information below should help clarify further. Given tables with the following schemas: CREATE TABLE item (id int, length float, weight float); CREATE TABLE item_info (item_id, name varchar(32)); # Is it legal (ANSI) SQL to write queries of this format ? SELECT id, name, foo, foobar, fredstats FROM A, B (SELECT id, foo(123) as foo, foobar('red') as foobar, fredstats('weight') as fredstats FROM item GROUP BY id HAVING [ALGEBRAIC EXPRESSION] ORDER BY id AS A), item_info AS B WHERE item.id = B.id Where: ALGEBRAIC EXPRESSION is the type of expression that can be used in a WHERE clause - for example: ((foo(x) < foobar(y)) AND foobar(y) IN (1,2,3)) OR (fredstats(x) <> 0)) I am using PostgreSQL as the db, but I would prefer to use ANSI SQL wherever possible. Assuming it is legal to include AGG FUNCS in the way I have done above, I'd like to know: Is there a more efficient way to write the above query ? Is there any way I can speed up the query in terms of a judicious choice of indexes on the tables item and item_info ? Is there a performance hit of using AGG FUNCs in an algebraic expression like I am (i.e. an expression involving the output of aggregate functions rather than constants? Can the expression also include 'scaled' AGG FUNC? (for example: 2*foo(123) < -3*foobar(456) ) - will scaling (i.e. multiplying an AGG FUNC by a number have an effect on performance?) How can I write the query above using INNER JOINS instead?

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