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Make SQL statements for the following scenarios. Your response should contain SQL statement, output and any other assumptions you have made to arrive at the answer.For Colorado customers compute the average amount of their orders and the number of orders placed. The result should contain the customer number, customer last name, average order amount and the number of orders placed. Query:
selectc.CUSTFIRSTNAME, c.CUSTLASTNAME, avg(p.PRODPRICE), count(ol.ORDNO) from customer c,ordertblot,ordlineol,product p where c.custno=ot.custno and ot.ordno=ol.ordno and p.PRODNO=ol.PRODNO group by c.CUSTFIRSTNAME,c.CUSTLASTNAME;
Define Signal. It allows methods to respond to events triggered by themselves or by other processes. Each signal corresponds to an exacting event. A signal is represented in Sy
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
Explain the function of Object model Object model describes the classes of objects in system, including their attributes and operations which they support. The analysis object
Explain the Aggregation implies concurrency Concurrency actually is: This in objects can be identified by the way they change state. Present objects can change state independen
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Differentiate between strict two-phase and rigorous two-phase with conversion protocol Ans: Strict two-phase locking holds all its exclusive that is write locks until commit t
Where does view definition stored? A view definition is permanently stored as part of the database.
An entity type usually has an attribute whose values are distinct for every individual entity in the collection. Such an attribute is known as a key attribute and its values can be
Problem 1 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples 2 Explain the following performance tuning techn
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