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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) Which statement produces the number of different departments that have employees with last name Smith?（）
- A、SELECT COUNT(*) FROM employees WHERE last_name='Smith';
- B、SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith';
- C、SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith';
- D、SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith';
- E、SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith';
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更多 “ 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) Which statement produces the number of different departments that have employees with last name Smith?（）A、SELECT COUNT(*) FROM employees WHERE last_name='Smith';B、SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith';C、SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith';D、SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith';E、SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith';” 相关考题
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