Eloquent DB Select from different Tables in one call

Hi. I try to make a simple example for my question. I have 3 tables (like video, music, image, ...). Each of the tables has id, name and user_id field. Now when a user logs in, I need to get all media files for the user. At the moment I would do 3 selects and then sort by created_at via helper functions for collections. But is there a way to select 3 tables at once, when tables have the same fields?

Another way would be to make copies in one database, but then I have content doubled in db tables. Not so perfect I think.

And another little problem I think about... Each media (video, music and image) should get a slug like at youtube (e.g. youtube.com/AbcD3F9...). Is this also possible when I have different tables, because I dont want duplicates. I use something like hashids package, but then I would have duplicates. In one table I can say unique() ... is something else possible for multiple tables? Otherwise I could make a prefix like VI for video or MU for Music.

I hope you understand my problem an can help. Thx.