A Fine Slice Of SQL Server
Andrew Pruski puts on the mad scientist lab coat:
In all honesty, this is just a bit of fun, I’m just playing around with the sp_invoke_external_rest_endpoint stored procedure, I don’t expect anyone to actually do this in a live environment. Anyway…let’s run through how this works.
Even so, read on to see how you can do this.
Comments closedLouis Davidson has a few blog posts for us to catch up on. So far, this is a four-part series on regular expressions and SQL Server.
Part 1 covers simple pattern matching:
I have never once written an regular expression prior to a couple of articles on this blog. And truth be told, when I published those blogs, I got the expression wrong because it seemed to work, and it was what Copilot told me would work. If you are new like me and/or your code is important, test with lots of cases. I obviously fixed that code (thankfully the conclusions were right).
So no, I have never.
LIKEdoes 99% of what I need in a simple manner, and .8% of the time in a complex way, so I never really thought about it too much. I suspect that will be the case even now in SQL, but like any good student, it is time to change my knowledge of regular expressions.
Part 2 covers repeating patterns:
In this blog, I want to look for strings that have 1 or more instances of a repeating pattern. For example, say you want to look for something like the following:
LIKE'%FredFredFred%' --(or any fixed or unlimited length of a, and only a) LIKE'%aaaaaaaaaaaaaaa%'or'%aaaaaaa%'
Part 3 looks at matching sets of characters:
In this article, we are going to take an initial look at what are referred to as “character classes” or “character sets” in Regular Expressions. They are commonly used when looking for data to be in a certain format. For example:
We are going to look at how to set a filter for
'lll-ll-lln'and/or'lll-ll-lll'(where l is letter and n is numeric).
And part 4 deals with negation:
In Part 3, I covered some of the basics of using character classes/sets. (I do tend to say sets.) This allowed us to do things like find words that start with a, b, c, d or e. This is done using:
^[a-e]or^[abcde]. Now I want to look at two new things (one of which looks really similar to the previous classes but does things very differently.:
- Negated character classes – Look for strings that don’t have a particular character in them
- Perl character classes – shorthand for certain types of characters
Regular expressions can be very challenging to learn and even more challenging to troubleshoot and ensure there are no missing corner cases. But they offer an enormous amount of power and that makes it all worthwhile.
Comments closedSebastiao Pereira takes a look at mssql-python:
Python can connect to SQL Server using drivers like
pyodbcandpymssql. However, Microsoft recently released a new Python driver called Python Driver for SQL Server ormssql-python. Currently in preview, Microsoft describes it as “the only first-party driver.” So, what’s this new driver all about, and how do you use it? Learn how to configure Python to connect to SQL Server with this new driver.
My standard caveat applies: this looks pretty neat, assuming that Microsoft actually continues to support it. Sebastiao mentions that it requires Python 3.13, but the docs say 3.10 or later. If the former is true, it might be a while before a lot of shops actually use it. But if the latter is true, most Python installations should support the driver out of the box.
Comments closedBen Richardson takes us through a what-if analysis:
What If Analysis is a modelling technique used to evaluate different outcomes by changing key input variables.
In Power BI, it uses What If parameters and dynamic DAX measures that recalculate outputs based on user input. Users can ask questions like:
- “What if sales increase by 10%?”
- “What if production costs drop by 5%?”
The parameters are created in the Modelling tab, where you define value ranges. Power BI automatically generates a slicer and a measure, which can then be used in DAX calculations to dynamically adjust metrics like revenue, cost, or profit.
Read on to see how it works, understanding that you have to provide the formulas for behavior. In other words, if your what-if parameter is around the unit price of some product, there is no built-in concept of price elasticity for the product. That’s something you’d have to implement yourself.
Comments closedJon Russell clarifies the situation:
SQL Server administrators often encounter Microsoft updates labeled as “CU + GDR”, and understandably, this can cause confusion — especially when trying to stay on a consistent CU-based servicing path. This post clarifies what “CU + GDR” really means and why it’s not something to worry about.
Read on for an overview of the different security models, as well as the odd duck in SQL Server 2016.
Comments closedReza Rad takes us through data changes:
Column or Bar chart can be easily used for showing a single measure’s insight across a category. Mixed charts such as Line and Column chart can be used for showing two measure and comparing their values across a set of categories. However there are some charts that can be used to show values of three measures, such as Scatter Chart. Scatter chart not only shows values of three measure across different categories, it also has a special Play axis that helps you to tell the story behind the data. In this post you’ll learn how easy is to visualize something with Scatter chart and tell a story with that. If you like to learn more about Power BI, read Power BI online book; from Rookie to Rock Star.
Read on for the blog post as well as a video version.
Comments closed