Exercise 1: draw an ER model for a barnes and nobles-like company. Draw the following relationship/entity types User posts a review User comments on a product

Publisher publishes a book.

Assumptions: a review can only be authored/posted by one person A book can only be released by a single publisher

Same for product (magazine, etc) draw.io Lucid chart Or you can draw on a piece of paper

For each entity type: specify its key. For each relationship type: specify whether its 1:n, 1:1, or m:n