@dbocquet welcome to the KNIME forum. KNIME is a great choice for ETL workflows with databases. Some of our finance guys especially like the fact that you can split your tasks into smaller steps that other people (like auditors) can then follow in details and the single nodes can have their own comments while working together in one logical flow that you can easily reproduce.
You can use the KNIME DB nodes for the low-code experience (but you will also be able to combine them with your own SQL code if you wish).
https://docs.knime.com/latest/db_extension_guide/index.html#query_generation
You might want to explore some examples. You can download KNIME and the examples on the hub for free and just try them for yourself
One additional thing you might like is the option to combine several nodes (steps) into one DB Transaction (that might succeed or fail as a whole and you might then be able to roll back - depending on your database):
If you explore the use of KNIME I would point you to this collection about “the case for KNIME” in general:
If you have further question you are welcome to ask them in the forum 
OK one more like to explore: