I have a view which list a content type order by date.
I just want to add a simple condition : the first element of the list must the one with
ID = X, even if it was created long time ago.
How can i do that ?
Add two sort criteria, the first one on that ID and the second on the date.
Please note that the "ID" must have the same value for all other nodes except the first to make this works.
So probably it will be necessary to use an extra field - boolean, or integer, depending how many nodes you want to fine control.
If you don't have a lot of content to order in that view you otherwise may consider Entityqueue or DraggableViews.