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Oracle Database 10g Administrator

Oracle Training Administer ASM disk groups

The EMP table has these columns:
ENAME VARCHAR2(35)
SALARY NUMBER(8,2)
HIRE_DATE DATE
Management wants a list of names of employees who have been with the company for more than five years.
Which SQL statement displays the required results?

A. SELECT ENAME
FROM EMP
WHERE SYSDATE-HIRE_DATE >5;
B. SELECT ENAME
FROM EMP
WHERE HIRE_DATE-SYSDATE >5;
C. SELECT ENAME
FROM EMP
WHERE (SYSDATE_HIRE_DATE)/365 >5;
D. SELECT ENAME
FROM EMP
WHERE (SYSDATE_HIRE_DATE)*/365 >5;

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Answer: C

Explanation:
Expression SYSDATE-HIRE_DATE will show number of days after date of hiring employee, so you need to
divide result of expression on 365 and this compare result with 5.
Incorrect Answers
A: This query returns all employees who were hired more than 5 days ago.
B: This query will not return any record because result of HIRE_DATE-SYSDATE expression will be negative
number.
D: You need to divide, not to multiply, SYSDATE-HIRE_DATE on the number of days in 1 year.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 81-85
Chapter 2: Limiting, Sorting, and Manipulating Return Data