Blog Archives

Filling [propagading] empty values with last nonNull value using T-SQL

So you have NULL values in your SQL Server table and you want to populate those NULL values with the last non-NULL value, based on a particular order. Once you have only one NULL values encapsulated between two populated values,

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SQL Saturday statistics – Web Scraping with R and SQL Server

I wanted to check a simple query: How many times has a particular topic been presented and from how many different presenters. Sounds interesting, tackling the problem should not be a problem, just that the end numbers may vary, since

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Passing two SQL queries to sp_execute_external_script

Recently, I got a question on one of my previous blog posts, if there is possibility to pass two queries in same run-time as an argument to external procedure sp_execute_external_script. Some of the  arguments of the procedure sp_execute_external_script are enumerated.

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Graph Database with T-SQL

SQL Server 2017 will bring users graph database. Graph database is type of database that uses graph attributes – edges (or relationships) and nodes (or vertices) and features, to store data. Relationship between nodes are through edges and features (also

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Installing R packages with rxInstallPackages in Microsoft R Server

In MicrosoftML package comes – in my opinion – long anticipated function for installing R packages for SQL Server and Microsoft R Server. And, I am super happy. Last year, in one of my previous blog posts, I have been

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Performance differences between RevoScaleR, ColumnStore Table and In-Memory OLTP Table

Running *.XDF files using RevoScaleR computational functions versus have dataset available in Columnstore table or in In-Memory OLTP table will be focus of comparison for this blog post. For this test, I will use the AirLines dataset, available here. Deliberately,

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Is it possible to use RevoScaleR package in Power BI?

I was invited to deliver a session for Belgium User Group on SQL Server and R integration. After the session – which we did online using web based Citrix  – I got an interesting question: “Is it possible to use

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