Lines in DATA MODEL

Hi, I am just curious about the lines use in data model, there is straight line and broken line ,what are there difference.

Thank you in advance.

please show your example – not just the lines themselves, but the entities that they’re connecting

Here it is, I just found it internet, also what does it means,in the products,there is a broken line pointing to itself.

i am afraid i do not understand the solid/broken lines here

the product table referring to itself is an example of a hierarchy – products can be composed of other products (e.g. a dining room set is made up of a table and chairs)

Thank you :slight_smile:

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