Author: Kristof

Do you know how to check a phone number?

Of course I do! Here’s a little nifty function you can use or expand for your own needs. This was made for Dutch mobile phone numbers but can be easily tweaked for any other type of phone number. The way this works is as follows. First we split the string into a table of single […]

Do you know how I can easily perform an 11-test (Elfproef)

The elfproef is a Dutch validation check that was used for bank account numbers before the introduction of IBAN and is still used for BSN (National identifier) and payment references in bank transaction. Here’s a sweet inline table valued function that will yield instant results. 1 million iterations of this take up almost no cpu […]