List of top Database Management Systems Questions

Consider the following relational schema along with all the functional dependencies that hold on them. 
R1(A, B, C, D, E): { \( D \rightarrow E \), \( EA \rightarrow B \), \( EB \rightarrow C \) } 
R2(A, B, C, D): { \( A \rightarrow D \), \( A \rightarrow B \), \( C \rightarrow A \) } 
Which of the following statement(s) is/are TRUE?

A tuple within a relation must be ______.
Which two constraints when applied together will produce a primary key constraint?
Which two constraints when applied together will produce a primary key constraint ?
(A) NOT NULL
(B) UNIQUE
(C) DEFAULT
(D) ZERO
Choose the correct answer from the options given below:
Which statement is used to add a constraint in existing attribute of a relation?
The Lucas sequence Ln is defined by the recurrence relation: Ln = Ln−1 + Ln−2, for n ≥ 3, with L1 = 1 and L2 = 3. Which one of the options given is TRUE?
Which one of the following given statements possibly contains the error?
In the following Query, which of the following can be placed in the Query's blank portion to display the salary from highest to lowest amount, and sorting the employees' names alphabetically?
SELECT * FROM instructor
ORDER BY salary .................... , name .................... ;
What do you mean by one-to-many relationships?
Which of the following are being managed by a database management system?