May 17, 2008
Discussion Group and Website integration - Monday, June 04, 2007

Our integration layer between our webiste (www.infoadvisors.com) and our discussion server (http://wb.itboards.com) is currently out of service.  That means if you are registering for the first time, you'll need to first register here on the website, then register again on the discussion group (via the ENTER link on each board's page).  If you use the same credentials on both, then when we turn integration back on your accounts will be in sync again.

Please register here on the website first.  Thanks for your patience.

 
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Welcome to InfoAdvisors' website dedicated to information technology processes.  You'll find subscriber-written articles on UML, data management, data modeling, process modeling, ITIL, information governance, as well as materials to help you improve your information management resources.




Great article on NULLs and queries

Mar 1

Written by: Karen Lopez
Thursday, March 01, 2007 2:11 PM

Michael Coles has a couple of good articles on NULLs, ANSI, SQL Server, the Four rules of NULLs, and unknowns:

http://www.sqlservercentral.com/columnists/mcoles/fourrulesfornulls.asp

http://www.sqlservercentral.com/columnists/mcoles/2829.asp

 

In one of the first articles I wrote for SQL Server Central, I talked about SQL NULLs and three-valued logic (Four Rules For NULL). In this article I take it all back...

No, not really, but stay tuned as we talk about the darker side of ANSI NULLs.

The Original Four Rules

The original four rules I proposed for NULL-handling are all reproduced here in Figure 1.

Figure 1. The original "Four Rules"

 

 

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