If condition on nodes

Hi everyone, i’m newby in knime

I need to be able to achieve the following algorithm, in which, if the DB Reader node marks “empty data” another node will be executed. As in the example below.

If the node does not contain data, it will run the lower node, but if it got data it will run a later node.

Thank you in advance and if you need more context, don’t hesitate to ask me :wink: