Notes from SQL Server Classes
Let’s start slow with a simple CTE query demo for easy absorption. Transcription of video: So let’s take a look at how to write a simple CTE query. So what I have is a test database here that I’ve set up called CTE demo. And in that I’ve got a couple tables one’s called royalty that has a bunch of …
Check out this video explanation of how to put multiple CTE’s in a single query. Check back tomorrow for the demo on this. Transcription to this video: Now that we’ve covered how to build a CTE and how to replace some derived tables or sub queries with CTE’s, now we’re going to look at how do we put multiple common …
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As a continuation from the day before, here is the multiple CTE’s in a query demo. Transcription of the demo: All right. So here’s an example of a simple CTE that just does a union to return a list that says John, Mary, and Bill. And then we have a second one, that’s last names that just returns, Smith give …
Steve dives into using CTEs instead of derived tables. What the benefit of CTEs Do CTEs over derived tables benefit performance? And a quick demo explanation Transcription of video: Now let’s take a look at some more complex examples of how to use a CTE instead of a derived table. Now use a CTE instead of a derived table, it’s …
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What is with, WITH? If you don’t know watch Steve’s quick 2 minute video explanation. Transcription of video: Okay, so the syntax of using common table expressions is to use the WITH keyword. all CTE start with the word WITH rather than select like you would normally have in your queries. And it can be confusing if you’re assuming that …
Steve quickly touches on which versions of SQL Server common table expressions are available on. Transcription of Video: So common table expressions have been available since SQL Server 2005. And I really wish that I’d learned about common table expressions when they first came out. I think it was around 2010 2011 that I first learned about them. And I …
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In this short but to the point video Steve explains the question “what is a CTE?” Transcription of this video: CTE is kind of this concept of what we’re calling a virtual table where it’s like a sub query or like a view where it’s referencing another chunk of SQL query that’s going to be used and named. Similar to …