understanding arrow tips in MySQL Workbench EER diagram
I used the reverse-engineer function to generate an EER diagram of the Yelp dataset as per this question here. It looks like this:
Does anyone know exactly how to interpret it? What do the arrow tips mean, eg the one with 3 tips and a line, the one with 2 parallel lines. Then there are some without any tips.
Then, does the point at which the arrow enter or leave a table mean anything, eg one leaves the tip table around text and enters the checkin table around count, or is that irrelevant?
Another detail I noticed in there is that the yellow lightbulb is probably a primary key and the red diamond, a foreign key. Still can't see from the diagram however how the coloured symbols and arrows connect.
Cardinality and ordinalitiy:
Source: https://www.lucidchart.com/pages/ER-diagram-symbols-and-meaning
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