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Question ID 1579

Examine the table structures:
EMP Table Name Null? Type
EMPNO NOT NULL NUMBER(4)
NAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SALARY NUMBER(7,2)
COMM NUMBER(7,2)
DEPTNO NOT NULL NUMBER(2)
TAX Table
Name Null? Type
TAXGRADE NUMBER LOWSAL NUMBER HIGHSAL NUMBER
 
You want to create a report that displays the employee details along with the tax category of each employee. The tax category is determined by comparing the salary of the employee from the EMP table to the lower and upper salary values in the TAX table.
Which SELECT statement produces the required results?
 

Option A

A.     SELECT e.name, e.salary, t.taxgrade FROM emp e, tax t
 
WHERE e.salary BETWEEN t.lowsal AND t.highsal;
 

Option B

B.    SELECT e.name, e.salary, t.taxgrade
FROM emp e, tax t
WHERE e.salary <= t.lowsal AND e.salary >= t.highsal;
 

Option C

C.    SELECT e.name, e.salary, t.taxgrade FROM emp e, tax t
WHERE e.salary IN t.lowsal AND t.highsal;
 

Option D

D.    SELECT e.name, e.salary, t.taxgrade
FROM emp e, tax t
WHERE e.salary >= t.lowsal AND <= t.highsal;
 

Correct Answer A
Explanation


Question ID 1580

Option A

A.    May reduce the amount of disk I/O for SELECT statements.
 

Option B

B.    May reduce the amount of disk I/O for INSERT statements.
 

Option C

C.    Increase the chance of full table scans.
 

Option D

D.    Store an index in the EMPLOYEE table.
 

Correct Answer A
Explanation

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