What do these symbols mean in the ER diagram?

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wideShift2021-12-03 17:07:25

PostgreSQL

wideShift, 2021-12-03 17:07:25

What do these symbols mean in the ER diagram?

I took up the study of PostgreSQL, found such a scheme Postgres Pro
Noted that it was not clear (3 questions)

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kalapanga, 2021-12-03
@kalapanga

Designations are easy to find, for example: https://www.lucidchart.com/pages/en/erd-%D0%B4%D0%...

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