MySQL No Data Return (Or no)

[FelixL]

I guess you have enabled the option “Always Output Data” in the MySQL node. (With that the node always outputs something even if there is no output from the MySQL query)

Here is a small demo how you could solve that with a simple expression in the IF node:
{{Object.keys($items()[0].json).length === 0}}

Source:

How to check for empty node output

Thank you! I elaborated another method based on your code to very simply put this directly inside a switch as an expression, so that one can then use the boolean result to determine which way to go: {{Object.keys($items()[0].json).length === 0}}