Performance-Analysis on The Lars Breddemann Blog

Why are your scalar UDFs slow? (mine aren't)

Mon, 09 Nov 2020 07:29:53 +0000

What is this about? #

In his blog post Why are scalar UDFs so slow? Jörg Brandeis wonders why user defined scalar functions (scalar UDFs) are slow compared to plain SQL. This is an important question since UDFs would make for very convenient development objects. SQL could be a lot easier to read and maintain if one could put complex or often reused computations into an UDF and just use this in queries, procedures and BW transformations.

Matchmaker - quick quick?

Thu, 26 Mar 2020 05:07:37 +0000

In Matchmaker, I developed a solution to a not-so-obvious problem.

The solution worked and delivered the right answer - finding documents where the line items match to a certain degree the line items of a reference document.

Matchmaker

Thu, 26 Mar 2020 05:07:31 +0000

SQL is an easy language to learn. A few commands to learn ( SELECT/FROM/WHERE/GROUP BY) and you are good to go.

One downside of the simple syntax and small vocabulary is that it can lead many SQL users to the assumption that these building blocks are all that can be expressed with SQL.

One in a Million

Sat, 08 Feb 2020 03:45:03 +0000

Q&A forums can be a treasure trove of interesting questions that turn out to have counter-intuitive answers.

In “Why does select statement taking too long when primary key is present?” the OP made an interesting observation: