I wanted to ask if anyone could explain to me how to read a database scheme that looks like the one on the picture?
The relations drawn by lines within the tables I do partially understand - if there’s a fork it means that the entity can have 1 or more of the other entity (for example HR departments can only have one HR location however locations can have several HR departments). But I do not understand why are they not connected with a full line?
I also do not understand what does the arrow coming from HR employees pointing back the HR employees mean?
Thank you for any help