Is R1 in BCNF? Is R2 in BCNF? Explain.
What will be an ideal response?
R1 is not in BCNF because of FD CD?B since CD is not a superkey.
R2 is in BCNF since D is a key.
Computer Science & Information Technology
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To move left one word with the keyboard, press the ____ key(s).
A. HOME B. OPTION-LEFT ARROW C. COMMAND-OPTION-LEFT ARROW D. COMMAND-LEFT ARROW
Computer Science & Information Technology
Consider the following schema:
Employee (ID,Name,Address) Supplier (ID,Name) PurchaseOrder (OrderID,EmpIssuerID,SupplierID,Date) PurchaseItem (ItemID,OrderID,ItemName,ItemCost)The first two schemas are self-explanatory. Each tuple in PurchaseOrder describes a purchase order issued by a particular employee to a particular supplier. The last relation, PurchaseItem, describes each ordered item and its relationship to the corresponding order. Write the following queries using the SQL language: (a) Names of employees who have made a purchase order that contains an item costing more than $150. (b) For each supplier, list the name and the total cost of all items ever ordered from this supplier. (c) Number of orders such that the total cost of items in each of those orders is over $200. (d) Names of employees who have issued a purchase order to every supplier.
Computer Science & Information Technology
Input an Internet address from input stream
What will be an ideal response?
Computer Science & Information Technology
When a relationship exists between two tables, the Form wizard automatically includes a(n) ________
Fill in the blank(s) with correct word
Computer Science & Information Technology