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• SELECT TOP 1

  - by Derek Dieter

  There are many good uses of the SELECT TOP 1 method of querying. Essentially, the select top 1 method is used to find the min or max record for a particular value. There is some debate as to whether this is the ‘correct’ method of querying, however it should be known that this [...]

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• SQL Server 2008 R2: StreamInsight changes at RTM: AdvanceTimeSettings

  - by Greg Low

  For those that have worked with the earlier versions of the simulator that Bill Chesnut and I constructed for the Metro content (the Highway Simulator), changes are also required to how AdvanceTimeSettings are specified. The AdapterAdvanceTimeSettings value is now generated by binding an AdvanceTimeGenerationSettings (that is based on your adapter configuration) with an AdvanceTimePolicy setting. public class TollPointInputFactory : ITypedInputAdapterFactory < TollPointInputConfig >, ITypedDeclareAdvanceTimeProperties...(read more)

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• Managing multiple customer databases in ASP.NET MVC application

  - by Robert Harvey

  I am building an application that requires separate SQL Server databases for each customer. To achieve this, I need to be able to create a new customer folder, put a copy of a prototype database in the folder, change the name of the database, and attach it as a new "database instance" to SQL Server. The prototype database contains all of the required table, field and index definitions, but no data records. I will be using SMO to manage attaching, detaching and renaming the databases. In the process of creating the prototype database, I tried attaching a copy of the database (companion .MDF, .LDF pair) to SQL Server, using Sql Server Management Studio, and discovered that SSMS expects the database to reside in c:\program files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\MyDatabaseName.MDF Is this a "feature" of SQL Server? Is there a way to manage individual databases in separate directories? Or am I going to have to put all of the customer databases in the same directory? (I was hoping for a little better control than this). NOTE: I am currently using SQL Server Express, but for testing purposes only. The production database will be SQL Server 2008, Enterprise version. So "User Instances" are not an option.

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• SQLU Professional Development Week: The Difference Between Your Business and Community Presence

  - by andyleonard

  Introduction Proto-earth , dinosaurs , and the days when your personal and business profiles were separate and distinct. What do these things all have in common? They are all in the past. Background Checks Corporate background checks now routinely include a search for social media profiles, forum posts, and blogs. As professionals are learning, the things you say and do in your "off-work hours" can and will be used against you - even after you're hired and have been doing the job awhile . One point?...(read more)

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• Experiments in Big Data Visualization on Maps

  Experiments in Big Data Visualization on Maps Brendan Kenny and Mano Marks continue their series on using the CanvasLayer library and HTML5 APIs to visualize large amounts of data on top of Google maps. This week they look at loading Shapefiles and KML directly in the browser and using WebGL to render their content over a map. From: GoogleDevelopers Views: 0 1 ratings Time: 00:00 More in Science & Technology

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• SQL Server: Writing CASE expressions properly when NULLs are involved

  - by Mladen Prajdic

  We’ve all written a CASE expression (yes, it’s an expression and not a statement) or two every now and then. But did you know there are actually 2 formats you can write the CASE expression in? This actually bit me when I was trying to add some new functionality to an old stored procedure. In some rare cases the stored procedure just didn’t work correctly. After a quick look it turned out to be a CASE expression problem when dealing with NULLS. In the first format we make simple “equals to” comparisons to a value: SELECT CASE <value> WHEN <equals this value> THEN <return this> WHEN <equals this value> THEN <return this> -- ... more WHEN's here ELSE <return this> END Second format is much more flexible since it allows for complex conditions. USE THIS ONE! SELECT CASE WHEN <value> <compared to> <value> THEN <return this> WHEN <value> <compared to> <value> THEN <return this> -- ... more WHEN's here ELSE <return this> END Now that we know both formats and you know which to use (the second one if that hasn’t been clear enough) here’s an example how the first format WILL make your evaluation logic WRONG. Run the following code for different values of @i. Just comment out any 2 out of 3 “SELECT @i =” statements. DECLARE @i INTSELECT  @i = -1 -- first resultSELECT  @i = 55 -- second resultSELECT  @i = NULL -- third resultSELECT @i AS OriginalValue, -- first CASE format. DON'T USE THIS! CASE @i WHEN -1 THEN '-1' WHEN NULL THEN 'We have a NULL!' ELSE 'We landed in ELSE' END AS DontUseThisCaseFormatValue, -- second CASE format. USE THIS! CASE WHEN @i = -1 THEN '-1' WHEN @i IS NULL THEN 'We have a NULL!' ELSE 'We landed in ELSE' END AS UseThisCaseFormatValue When the value of @i is –1 everything works as expected, since both formats go into the –1 WHEN branch. When the value of @i is 55 everything again works as expected, since both formats go into the ELSE branch. When the value of @i is NULL the problems become evident. The first format doesn’t go into the WHEN NULL branch because it makes an equality comparison between two NULLs. Because a NULL is an unknown value: NULL = NULL is false. That is why the first format goes into the ELSE Branch but the second format correctly handles the proper IS NULL comparison.   Please use the second more explicit format. Your future self will be very grateful to you when he doesn’t have to discover these kinds of bugs.

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• R: What's the easiest way to print out pairs of values from a data.frame?

  - by John

  I have a data.frame: df<-data.frame(a=c("x","x","y","y"),b=c(1,2,3,4)) > df a b 1 x 1 2 x 2 3 y 3 4 y 4 What's the easiest way to print out each pair of values as a list of strings like this: "x1", "x2", "y1", "y2"

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• Utility Queries–Database Files, (and Filegroups)

  - by drsql

  It has been a while since I last posted a utility query, and today, to avoid other work I am supposed to be doing, I decided to go ahead and work on another post.  Today, I went ahead and worked on a server configuration type query. One query I find I use pretty often is the following one that lists the files in the database. In this blog I will include 3 queries.  The first will deal with files and databases, and the second runs in a database to see the files and their filegroups (If there...(read more)

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• SQLRally Nordic 2012 – session material

  - by Hugo Kornelis

  As some of you might know, I have been to SQLRally Nordic 2012 in Copenhagen earlier this week. I was able to attend many interesting sessions, I had a great time catching up with old friends and meeting new people, and I was allowed to present a session myself. I understand that the PowerPoint slides and demo code I used in my session will be made available through the SQLRally website – but I don’t know how long it will take the probably very busy volunteers to do so. And I promised my attendees...(read more)

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• A High Level Comparison Between Oracle and SQL Server

  Organisations often employ a number of database platforms in their information system architecture. It is not uncommon to see medium to large sized companies using three to four different RDBMS packages. Consequently the DBAs these companies look for often ... [Read Full Article]

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• What's the best way to keep java app data stored redundantly in a file?

  - by Bijan

  If I have systems that are based on realtime data, how can I ensure that all the information that is current is redundantly stored in a file? So that when the program starts again, it uses this information to initialize itself back to where it was when it closed. I know of xstream and HSQLDB. but wasn't sure if this was the best option for data that needs to be a literal carbon copy.

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• Recovering Data from a Corrupt MS Access Table

  A corrupt table in MS Access means lost time and data. It can lead to a loss of revenue or even employment. Learn how you might be able to recover most of the data when the worst happens.

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• Maintaining SQL Server default trace historical events for analysis and reporting

  I often see questions online where someone wants to find out who started a trace, when tempdb last had an autogrow event, or when the last full backup for master occurred. Since these and other events are captured by the default trace, but the default trace only keeps five 20MB rollover files by default. This means that the event you are after may no longer be there, depending on how long ago it was and how busy your server happens to be. Unfortunately, people often need to find this information well after the fact.

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• Path of Replication

  - by geeko

  I'm currently developing a replication system to keep data in-synch between an arbitrary number of servers. Some of these servers exist in one cluster on one LAN. Others exist somewhere else in the world. I'm wondering what are the pros/cons of different paths that we choose to flow replicated data on between servers? In other words, what are the different strategies to load balance the replication process ?

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• Celko's SQL Stumper: Eggs in one Basket

  Joe Celko returns with another stumper to celebrate Easter. Unsurprisingly, this involves eggs. More surprising is the nature of the puzzle: This time, the puzzle is one of designing a database rather than a query. DDL as well as the DML.

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• Simple Steps to Prepare Mirror Database for Mirroring in SQL Server

  To prepare a database for mirroring, you need to perform the following steps: Script the restore of the latest full database backup, script the restore of every transaction log backup that has been made after that full database backup, copy the full database backup and transaction log backups to the mirror server, and run the restore scripts on the mirror server. In this tip I will walk through these steps and provide sample scripts to prepare a database for mirroring.

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• Generating a Dynamic Date Table to Find Missing Dates

  - by Derek D.

  Generating a date table on the fly is nice to have for many reasons. The most recent of my adventures required determining when employees did not enter their time in their timesheets. I know I had a tattle tale job, the ironic part is that I ended up getting in trouble the next [...]

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• SQL Lunch #19-Configuring, Deploying and Scheduling SSIS Packages

  May 10, 2010, 11:30CST. Now that you have created your SSIS packages it’s time to add some configuration files that will ease your deployments. Wait how do you deploy one or two or three SSIS packages? Uh oh, now that they are deployed how do you schedule them? Well join Patrick LeBlanc in his discussion on how to Configure, Deploy and Schedule your SSIS packages.

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• Using a PowerShell Script to delete old files for SQL Server

  Many clients are using custom stored procedures or third party tools to backup databases in production environments instead of using database maintenance plans. One of the things that you need to do is to maintain the number of backup files that exist on disk, so you don't run out of disk space. There are several techniques for deleting old files, but in this tip I show how this can be done using PowerShell.

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• SQL Server 2005 - Enabling both Named Pipes & TCP/IP protocols?

  - by Clinemi

  We have a SQL Server 2005 database, and currently all our users are connecting to the database via the TCP/IP protocol. The SQL Server Configuration Manager allows you to "enable" both Named Pipes, and TCP/IP connections at the same time. Is this a good idea? My question is not whether we should use named pipes instead of TCP/IP, but are there problems associated with enabling both? One of our client's IT guys, says that enabling database communication with both protocols will limit the bandwidth that either protocol can use - to like 50% of the total. I would think that the bandwidth that TCP/IP could use would be directly tied (inversely) to the amount of traffic that Named Pipes (or any of the other types of traffic) were occupying on the network at that moment. However, this IT person is indicating that the fact that we have enabled two protocols on the server, artificially limits the bandwidth that TCP/IP can use. Is this correct? I did Google searches but could not come up with an answer to this question. Any help would be appreciated.

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• New Certification Exam: "Oracle Database 12c: SQL Fundamentals" Released (1Z0-061)

  - by Brandye Barrington

  Oracle Certification begins testing this week for the new Oracle Database 12c Administrator Certified Associate (OCA) certification.  Testing for the Oracle Database 12c: SQL Fundamentals (1Z0-061) exam is now underway. Visit pearsonvue.com/oracle and register for exam 1Z0-061. You can get all preparation details, including exam objectives, number of questions, time allotments, and pricing on the Oracle Certification Website. Earning the Oracle Database 12c Administrator Certified Associate (OCA) credential demonstrates that you carry the foundational knowledge and skills needed to administer the Oracle Database, and sets the stage for your future progression to Oracle Database 12c Administrator Certified Professional (OCP). With Oracle Database 12c, you will experience the benefits of an Oracle Database that is re-engineered for Cloud computing. Multitenant architecture brings enterprises unprecedented hardware and software efficiencies, performance and manageability benefits, and fast and efficient Cloud provisioning. Oracle Database 12c certifications emphasize the full set of skills that DBAs need in today's competitive marketplace. Be among the first to obtain this ground breaking new Oracle Certified Associate (OCA) certification by registering for this exam today. QUICK LINKS Certification Path: Oracle Database 12c Administrator Certified Associate (OCA) Certification Exam: Oracle Database 12c: SQL Fundamentals (1Z0-061) Registration: pearsonvue.com/oracle

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• Lookup for data sources in a query

  - by DAXShekhar

  public static str lookupDatasourceOfQuery(Query _query) {     Query                   query = _query;     QueryBuildDataSource    qbds;     int                     dsIterator;     Map                     map = new Map(Types::String, Types::String);     ;     for (dsIterator = 1; dsIterator <= query.dataSourceCount(); dsIterator++)     {         qbds = query.dataSourceNo(dsIterator);         map.insert(qbds.name(), qbds.name());     }     return pickList(map, "Data source", "Data sources"); }

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• How to reduce MDX code redundancy in SQL Server Analysis Services (SSAS)

  To query an Analysis Services cube, MDX is used as the query language. In most business settings, one would find a set of queries that are common across a number of user query requirements. To cater to this, even with a modest size IT team, there is a good chance that the same queries are developed redundantly either within a SSAS MDX script or repetitively in an ad-hoc manner in client applications. In this tip we would look at how to reuse queries without redeveloping them over and over.

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• Solving the SQL Server Multiple Cascade Path Issue with a Trigger

  This tip will look at how you can use triggers to replace the functionality you get from the ON DELETE CASCADE option of a foreign key constraint. Keep your database and application development in syncSQL Connect is a Visual Studio add-in that brings your databases into your solution. It then makes it easy to keep your database in sync, and commit to your existing source control system. Find out more.

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• Visualizing Data with the Google Maps API: A Journey of 245k Points

  Visualizing Data with the Google Maps API: A Journey of 245k Points What can you do with some awesome geospatial data, the Google Maps API, and a couple of days of hacking and analysis? Brendan and Paul walk through how they used the Maps API to visualize the CLIWOC database, and pass on tips and trick for doing the same with other geospatial datasets. CLIWOC (Climatological Database for the World's Oceans, 1750-1850): www.ucm.es From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Education

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