Microsoft introduced the APPLY operator in SQL Server 2005. This under-used, non-standard operator can help us solve a number of common (and not-so-common) problems with elegant code which performs well. We will look several problem spaces in which the APPLY operator shines, such as joining to table-valued functions, getting the top N child records for each parent record, string splitting, and word matching. With the use of these examples, we will gain a deeper understanding of when to use the APPLY operator.
The slides are available in HTML 5 format. All modern browsers (including tablets and phones) should be able to navigate the slides successfully.
The slides are licensed under Creative Commons Attribution-ShareAlike.
The demonstration code is available on my GitHub repository.
The source code is licensed under the terms offered by the GPL. The slides are licensed under Creative Commons Attribution-ShareAlike.
On October 14, 2015, Carlos L. Chacon interviewed me for his SQL Data Partners podcast. You can get the recording and show notes on the SQL Data Partners podcast website.
I used a number of third-party scripts and examples in this demo, and would like to give credit to the authors once more:
In addition to those references, here are a couple more which helped shape my presentation:
I also have a few blog posts which make use of the APPLY operator. These are mostly on the administrative side, whereas the presentation focused more on the development side.
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