Adding the practice problems ERD for justLee books.

practiceProblems/week1/justLee.er

+# just lee
+# Use MS Visio to draw an entity-relationship diagram (ERD) for the JustLee Book database (reference the structure of the database in
+# Figure 1-5 in the Ppt presentation above). Draw a fully-labeled ERD that includes entities, labeled relationships 
+# (indicate whether each relationship is mandatory or optional),
+# primary keys, foreign keys, and cardinalities. Follow the format (Crow’s Foot notation) and naming conventions used in class.
+
+[CUSTOMERS]
+*CustomerN
+Lastname
+Firstname
+Email
+Address
+City
+State
+Zip
+Referred
+Region
+
+[ORDERS]
+*OrderN
++CustomerN
+Orderdate
+Shipdate
+Shipstreet
+Shipcity
+Shipstate
+Shipzip
+Shipcost
+
+[ORDERITEMS]
+*+OrderN
+*+ItemN
+ISBN
+Quantity
+Paideach
+
+[BOOKS]
+*ISBN
+Title
+Pubdate
++PubID
+Cost
+Retail
+Discount
+Category
+
+[PROMOTION]
+*Gift
+Minretail
+Maxretail
+
+[PUBLISHER]
+*PubID
+Name
+Contact
+Phone
+
+[BOOKAUTHOR]
+*+ISBN
+*+AuthorID
+
+[AUTHOR]
+*AuthorID
+Lname
+Fname
+
+CUSTOMERS 1--* ORDERS
+ORDERS 1--+ ORDERITEMS
+BOOKS 1--+ ORDERITEMS
+BOOKS 1--+ BOOKAUTHOR
+PUBLISHER 1--* BOOKS
+AUTHOR 1--* BOOKAUTHOR
+#PROMOTION 1