Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?（）A、SELECT UNIQUE dept FROM staffB、SELECT DISTINCT dept FROM staffC、SELECT (dept) UNIQUE FROM staffD、SELECT (dept) DISTINCT FROM staff
Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?（）
- A、SELECT UNIQUE dept FROM staff
- B、SELECT DISTINCT dept FROM staff
- C、SELECT (dept) UNIQUE FROM staff
- D、SELECT (dept) DISTINCT FROM staff
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