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Oracle Training Change RMAN default settings with CONFIGURE
Examine the description of the EMPLOYEES table:
EMP_ID NUMBER(4) NOT NULL
LAST_NAME VARCHAR2(30) NOT NULL
FIRST_NAME VARCHAR2(30)
DEPT_ID NUMBER(2)
JOB_CAT VARCHARD2(30)
SALARY NUMBER(8,2)
Which statement shows the maximum salary paid in each job category of each department?
A. SELECT dept_id, job_cat, MAX(salary)
FROM employees
WHERE salary > MAX (salary);
B. SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id,job_cat;
C. SELECT dept_id, job_cat, MAX(salary)
FROM employees;
D. SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id;
E. SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept _ id job _ cat salary;
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Answer: B
Explanation:
This answer provides correct syntax and semantics to show the maximum salary paid in each job category of
each department.
Incorrect Answers
A: This query will not return any row because condition SALARY > MAX(SALARY) is FALSE.
C: This query will return error because you cannot show maximum salary with DEPT_ID and JOB_CAT
without grouping by these columns.
D: The GROUP BY clause is missing JOB_ID column.
E: You don't need to group results of query by SALARY in the GROUP BY column.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 356-365
Chapter 8: User Access Control in Oracle