After my CTE presentation at SQL Saturday 108 in Redmond, I was asked many questions, and received several great suggestions from people. Based on that feedback, I am updating my presentation for SQL Saturday 114 in Vancouver to include some additional content. One question was how does the performance compare between a recursive CTE to generate a hierarchical tree path …
WOW, what a great day at SQL Saturday 108 in Redmond. I started out with a keynote presentation from Buck Woody. Then I delivered my presentation on Common Table Expressions. Which I think went well. There were some great questions and I look forward to refining my presentation to include some of the questions that I was asked at the …
What is a Factorial: The product of an integer and all the integers below it; e.g., factorial four (4!) is equal to 24. The factorial of a positive integer n, written n!, is the product of all the positive integers from 1 up to and including n Example: 1! = 1 2! = 1 * 2 = 2 3! = 1 * …
Queries with Common table expressions (CTE) are made up of two parts, the CTE part, and the SQL that references the CTE. In preparation for SQL Saturday, the question came up of can you use an INSERT or UPDATE statement with a CTE. Referring to the documentation I confirmed that using an insert or update inside of the CTE is …
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 »
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!
I just checked the schedule and 2 of the sessions that I submitted for SQL Saturday 114 in Vancouver BC on March 17th have been accepted. The first one is on Unleashing Common Table Expressions in SQL Server, and the second session is Using SSRS reports to analyze SQL Server health. This should be fun!