Give an example of a primary key

What distinguishes a primary key from a candidate key or a superkey?

List out the steps for finding Use cases

6. SELECT e.Last_Name, m.Last_Name AS "Manager Name", e.Salary*12 AS "Annual Salary", 1.City FROM employees e JOIN employees m ON e.Manager_id = m.Employee_Id JOIN departments d ON d.Department_id = e.Department_Id JOIN locations 1 ON 1.Location_id = d.Location_id WHERE 1.City = "California"

The following query needs some consideration: "What does this statement mean?" Can you please let me know whether the following statement about the subject of software engineering is true?

Identify the errors in the following DFD. Clearly write what are the errors available in the same. (5 marks) Donos Bank Donation Deposit Donation Process donation Donation list Member donation Donation Member info Member info Info 1.4 1.2 Process application Make member Update member list Application form Member ID Memer into 2 Member list Prospective Members Membens 1.5 Generate document Update mailing list Member addres E Mailing list File letter Letter 18 Letter 1.7 1.9 Mail prosped Publish Mail members

Under what circumstances would it be reasonable to assume that two select statements from the same database are consistent with one another?

Why are certain functional dependencies said to be trivial?

What is the meaning of the primary key?

2. DEL Transactions: The following transaction schedule is given. A,B,C are the addresses of the records in the database and T1, T2 and T3 are the transactions. T1 R(A)W(A) R(C) R(B)W(B)C T2 T3 R(B) W(B) R(C) R(B)W(B) R(A) с a) Show an example of a strict 2PL implementation that leads to a deadlock b) For a) draw a >>wait-for<< graph c) Avoid the previously drawn deadlock with a wait-die<< policy d) Give an example of another schedule that would be conflict-equivalent to the given schedule of transactions W(A)C