For my articles, i've added a field "external_link". If this link is set, the headline should link to an external website, and if not, the headline should open the articles detailview.
Now i have the fields of my view two fields, which are excluded from the display, the external_link, and the nid. And on the headlinefield, i can do a
"rewrite results -> output this field as a link" and write either node/[nid] or [external_link],
but how to use conditions in views, to use the external_link if set, and the node/[nid] if not set? I'm new to Drupal and i have no idea how or where to add this condition...