A. SELECT课程号,课程名,最高分FROM KC,SKB B. SELECT KC.课程号,KC.课程名,SKB.最高分; FROM KC,SKB WHERE KC.课程号=SKB.课程号 C. SELECT KC.课程号,KC.课程名,SKB.最高分; FROM KC INNER JOIN SKB; ON KC.课程号=SKB.课程号; GROUP BY SKB.课程号 D. SELECT KC.课程号,KC.课程名,MAX(SKB.成绩) AS 最高分; FROM EC INNER JOIN SKB; ON KC.课程号=SKB.课程号; GROUP BY SKB.课程号