Aaron Akin

March 18, 2009

Nested Common Table Expressions

Filed under: CTE,SQL,SQL 2005,SQL 2008,TSQL — Aaron Akin @ 8:01 pm

If you’ve looked up a Common Table Expressions in Books Online, you might have noticed that Microsoft says that you cannot have nested CTEs (meaning, you can’t define a CTE in the definition of another CTE. Although this is technically true, you can still accomplish the same functionality in a different manner.


February 18, 2009

SSIS 2005 Connections from SSMS 2008

Filed under: SQL 2005,SQL 2008,SSIS,SSMS — Aaron Akin @ 5:17 pm

After I first installed SQL 2008, I tried to connect to SSIS 2005, and to my surprise, received the error, “Connect to SSIS Service on machine xxx failed: Class not registered.”  Thanks for the descriptive error message, Microsoft.

Cannot Connect to Server

Apparently, you cannot connect to SSIS 2005 from within SSMS 2008.  I found a feedback ticket with Microsoft that confirms the issue, though I wasn’t completely clear if they are planning on fixing it or not.

So, for those of you who installed SSMS 2008, make sure you keep SSMS 2005 installed as well if you still have SSIS 2005 packages out there…even if it is a pain to have to switch back and forth.


February 2, 2009

Sorting SSIS Packages & Folders in SSMS

Filed under: SQL,SQL 2005,SQL 2008,SSMS — Aaron Akin @ 5:24 pm

It had always bothered me when I opened a SQL 2005 Integrated Services instance to find an SSIS package, only to see that the folders and packages were not in alphabetical order.

SSMS Object Explorer

It wasn’t long before this started to get irritate me.  I did some digging and found 2 system stored procedures (sp_dts_listfolders and sp_dts_listpackages) in the msdb database that SQL Server uses to display the packages and folders in menus.


January 21, 2009

Recursive Common Table Expressions – Part 2

Filed under: CTE,SQL,SQL 2005,TSQL — Aaron Akin @ 7:48 pm

In my last post, Recursive Common Table Expressions – Part 1, I gave a brief overview of common table expressions (CTE) and gave some examples on how to use them to write recursive queries.  The first two examples showed how to find the missing numbers, or dates, in a sequence.  It was assumed that you already had a table with a list of numbers or dates in it.  The examples in this post will expand on the first two examples to show you how to build a range of numbers or dates given a starting and ending point.


January 20, 2009

Recursive Common Table Expressions – Part 1

Filed under: CTE,SQL,SQL 2005,TSQL — Aaron Akin @ 6:43 pm


I recently had a project that required me to find the number of employees who were scheduled for every 15 minute increment, for every business day for a week, and for many stores.  Yikes!  Sure, I could use tons of loops and temp tables to do this, but I’m all about set based queries whenever possible…and I knew this was possible and I love a challenge!

It finally occurred to me that I could use the self-referencing (recursive) capabilities of Common Table Expressions (introduced in SQL 2005) to the mimic loops I needed to accomplish my goal.

I took some of the recursive CTE queries that I came up with for my project and turned them into 4 examples.  It was quite a bit of info, so I’ll be spreading them across 2 posts.


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