Question: Consider the following six relations for an order-processing database application in a company: CUSTOMER (Cust#, Cname, City) ORDER (Order#, Odate, Cust#, Ord Amt) ORDER ITEM
Consider the following six relations for an order-processing database application in a company:
CUSTOMER (Cust#, Cname, City)
ORDER (Order#, Odate, Cust#, Ord Amt)
ORDER ITEM (Order#, Item#, Qty)
ITEM (Item#, Unit price)
SHIPMENT (Order#, Warehouse#, Ship date)
WAREHOUSE (Warehouse#, City)
Here, Ord Amt refers to total dollar amount of an order; Odate is the date the order was placed; Ship date is the date an order is shipped from the warehouse. Assume that an order can be shipped from several warehouses.
Give an update operation to a database state that violates an entity integrity constraint, stating any assumptions on the database state you make.
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