单选题

Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMPLOYEES e, DEPARTMENTS d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?()

Aselection, projection, join

Bdifference, projection, join

Cselection, intersection, join

Dintersection, projection, join

Edifference, projection, product

正确答案

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答案解析