As part of my CTE research for my SQL Saturday presentation in Redmond in 2 weeks I decided to take on some classic computer science algorithms with CTE’s. Here is what I cam up with. Any math geek can tell you what the Fibonacci Sequence is, but do you know how to calculate it with a query? First, what is …
The following example shows how to create a Tree Path with a Common Table Expression (CTE). First off what is a tree path? For this example I will be referring to the product categories at a camping and fitness store, where you have a top level with 4 categories, and some of the categories have subcategories: Camping Tents 1 Person …
The following question came up when working on my CTE presentation for SQL Saturday. Does a query that JOINs a CTE to itself execute the CTE query once or twice? For instance: ;WITH deptCTE(id, department, parent) AS (SELECT id,department,parent FROM Departments) SELECT q1.department,q2.department FROM deptCTE q1 INNER JOIN deptCTE q2 ON q1.id = q2.parent WHERE q1.parent IS NULL; The following execution plan is produced showing that the Departments table is hit twice with a table scan …
After being approved as a speaker at SQL Saturday 114 – Vancouver BC, and SQL Saturday 108 – Redmond WA, I have decided to give it another shot at SQL Saturday 120 in Orange County California. I have submitted 2 abstracts for sessions: The first one is titled Unleashing Common Table Expressions in SQL Server, and if accepted this will be …
Sessions Submitted for SQL Saturday #120 Orange County CA Read more »
Having taught several Introduction to SQL Server classes, it is always a challenge for new users to get SQL Server running on their computer for the first time. I have seen cases where people attempt to download the 90 day trial, if that even exists any more, or to download SQL Express. Here is my recommendation, for developers or anyone …
I just checked the schedule and one of the sessions that I submitted for SQL Saturday 108 in Redmond WA on February 25th has been accepted. I will be presenting Unleashing Common Table Expressions in SQL Server. If you are going to be there, drop me an email and let me know. This should be fun!
At work today… The snowstorm shot of the parking lot at work in Bellinhgam WA. Although it does’t look like that much snow, this is a lot for Bellingham. Snowstorm in Bellingham today. -STEVE STEDMAN
More snowing coming down in Bellingham today.
After rebooting a SQL Server, for whatever reason, it is always good to confirm that the system is running good. There are many things that I check, one of which is to confirm that backups are running. You can always go to the server browse to the various directories holding backups, and check on the latest files. This can be …
I am now getting back into things after the holidays. Today I fixed a number of small layout related bugs in the SQL Server health reports. The updated reports are now available for download. Here is a sample of the Fragmented Indexes report.