Listing 1 ER diagram
graph G { rotate = 90; B_ISBN[label="ISBN"]; B_Title[label="Title"]; B_Price[label="Price"]; O_id[label="id"]; O_TC[label="Total Cost"]; O_DC[label="Delivery Cost"]; node[shape=rectangle]; Book[label="Book"]; Order[label="Order"]; BO[label="Book Order relation", shape=diamond]; B_ISBN -- Book[len=1.2]; B_Title -- Book[len=1.2]; B_Price -- Book[len=1.2]; O_id -- Order[len=1.2]; O_TC -- Order[len=1.2]; O_DC -- Order[len=1.2]; Book -- BO[label = "1", len=2]; Order -- BO[label = "m", len=2]; }