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单项选择题 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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