Statistics in SQL: The Mann–Whitney U test
Phil Factor shows how to use the Mann-Whitney U test in SQL to to find out whether two samples come from the same distribution.
2017-09-04
4,456 reads
Additional Articles
What is the biggest mistake you made in production?
When you have sysadmin access, you are bound to make a big mistake in production at some point in your career - in this post Tara Kizer looks back at what hers were.
2017-09-01
4,773 reads
Resolving could not open a connection to SQL Server errors
Have you ever gotten connectivity errors from SQL Server? Jugal Shah explains the common causes for these errors, and advises on the steps you can take to resolve them.
2017-08-31
3,542 reads
Automating the Synchronization of RDS SQL Server Agent Jobs in a Multi-AZ Environment
Although Azure is the obvious Cloud service to host SQL Server, Amazon Relational Database Service (RDS) for SQL Server is a good choice when your organisation uses AWS. RDS deals with maintenance and monitoring, and supports the use of PowerShell to automate routine tasks. What if a script needs to be triggered by an unscheduled event? Even in this case, RDS can be configured to run scripts to react when something like a failover happens. Laerte Junior shows how easy it is to set up Lambda functions and some PowerShell scripts to automatically synchronise agent jobs after a failover.
2017-08-30
2,895 reads
Fighting Evil in Your Code: Comments on Comments
One of the most glib generalisations you can make about development work is to say that code should be liberally commented, or conversely that it should never be commented. As always, the truth is more complicated. There are many different types of comment and some types are best treated firmly with the delete key, where others are to be cherished and maintained assiduously. Even though it is hard to find two developers who agree on the topic of commenting, Michael Sorens warily sketches out the issues and the battleground.
2017-08-29
3,670 reads
Implementing Azure SQL Data Sync in the Azure Portal
Azure SQL Data Sync, which has been lingering in the Preview mode since its introduction seven years ago, no longer requires the use of the Azure classic portal; you can finally access it by using the current Azure portal. Marcin Policht steps you through the process of implementing Azure SQL Data Sync using this interface.
2017-08-28
2,868 reads
The Basics of Good T-SQL Coding Style – Part 3: Querying and Manipulating Data
SQL was designed to be a third-generation language, expressed in syntax close to real language, because it was designed to be easy for untrained people to use. Even so, there are ways of expressing SQL Queries and data manipulation in ways that make it easier for the database engine to turn into efficient action. and easier for your colleagues to understand. Robert Sheldon homes in on data querying and manipulation and makes suggestions for team standards in SQL Coding.
2017-08-25
5,735 reads
Installing SQL Server Agent on SUSE Linux
Manvendra Singh explains how to install SQL Server Agent on SUSE Linux server, so that you can create SQL Server Jobs to schedule repetitive work.
2017-08-23
3,181 reads
How to Find Out Which Database Object Got Deleted
Greg Larsen shows you how to use the Transaction ID value to identify the object_id for a deleted table.
2017-08-22
4,419 reads
Is It Time To Stop Using IsNumeric()?
The old system function IsNumeric() often causes exasperation to a developer who is unfamiliar with the quirks of Transact SQL. It seems to think a comma or a number with a 'D' in the midde of it is a number. Phil Factor explains that though IsNumeric has its bugs, it real vice is that it doesn't tell you which of the numeric datatypes the string parameter can be coerced into, and because it doesn't check for overflow. Phil comes to the rescue with a couple of useful alternatives, one of which works whatever version of SQL Server you have, and which tell you what datatype the string can be converted to.
2017-08-21
4,500 reads
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The Long Name
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Question of the Day
The Long Name
I run this code to create a table:
When I check the length, I get these results:
A table name is limited to 128 characters. How does this work?