database

In a relational database, a B+ Tree Index is to be constructed for a relation on a key field. In a B+ Tree, a Node Pointer points to a sub-tree and a Data Record Pointer points to...

Consider the given relations X, Y and Z. The relation X has three columns P, Q and R. The relation Y has three columns P, Q and S. The relation Z has two columns P and T. Consider...

Consider a table Employee (EmpID, TeamID), where the column EmpID (ID of an employee) is the primary key. The column TeamID denotes the team ID of the team of which the employee is...

Let there be two relations X and Y as shown. X has three columns P, Q and R. Y has two columns P and S. Consider that the following tuple relational calculus expression is evaluate...

Let Account be a relation as shown. Consider the given SQL query. SELECT AccNo FROM Account AS A WHERE (SELECT COUNT(*) FROM Account AS B WHERE A.Balance = (SELECT COUNT(*) FROM Ac...

Consider an ER model with the entities E1 (A11, A12, A13) and E2 (A21, A22, A23), where, A11, A12, A13 are the attributes of E1, and A21, A22, A23 are the attributes of E2. Let A22...