Find the error in the program segments. Explain how to correct the error.
```
int sum(int x, int y) {
2 int result;
result = x + y;
}
```
Error: The method is supposed to return an integer, but does not.
Correction: Delete the variable result, and place the statement
```
return x + y;
in the method, or add the following statement at the end of the method body:
return result;
```
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Prove that the algorithm for synthesizing 3NF decompositions yields schemas that satisfy the conditions of 3NF.
Use the proof-by-contradiction technique. Assume that some FD violates 3NF and then show that this contradicts the fact that the algorithm synthesized schemas out of a minimal cover.
David is working on a database that stores student exam grades. He needs to design a query that will display the lowest exam grade. He should use the ________ function in Expression Builder on the column containing the exam grades
Fill in the blank(s) with correct word
A(n) _______ card allows video signals normally seen on a TV to be viewed on a computer
Fill in the blank(s) with correct word
Your company has implemented a new authentication system for the server room. To be given access to the room, a user must provide his user name and password. Once those factors are authenticated, the user must then provide his smart card. Which type of authentication is being used?
A. one-factor authentication B. two-factor authentication C. three-factor authentication D. four-factor authentication