Using KNIME Recursive Loops with a GraphQL API

Introduction This guide will show you how to use a recursive loop to download data from an API. I my case I’ll be using a GraphQL API but the approach would work in a similar way for any other REST API. This guide will not go into the details about the workings of GraphQL as …

Dynamically Output to Multiple Files in KNIME

The Problem How to output to multiple files with dynamic contents and unique names using KNIME without hardcoding filters and using multiple branches? Loops, you need loops. Coming from Alteryx that doesn’t have loops (you are required to use macros to achieve the same effect) it took me a while to understand KNIME loops. But …

KNIME Database SQL Filter using the IN Operator

Sometimes using KNIME it would be nice to create a DB row filter based on a list of items. When not using DB tools you can use the reference row filter but this cannot be used with DB connections. The other standard method would be to use the DB Row Filter but this only supports …

Default Include or Exclude New Columns in KNIME

It’s common when creating a new workflow that after the flow is finished the source data can change. The most common scenario is when connected to a database table or view and the data gets extra columns added. In this scenario you need to make sure that your workflow doesn’t break caused by the introduction …