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【单选题】
设成绩表中有学号、课程号、总评分、卷面分和平时分等五个字段,后三个为数字型字段。课程P002的总评分=卷面分*70%+平时分*30%,则计算课程P002的总评分正确的语句是( )。A.
UPDATE 成绩 SET 总成绩 = 卷面分*70%+平时分*30% WHERE 课程号 = "P002"
B.
UPDATE 成绩 SET 总成绩 = 卷面分*70%+平时分*30% WHERE 课程号 = P002
C.
UPDATE 成绩 SET 总成绩 = 卷面分*0.7+平时分*0.3 WHERE 课程号 = "P002"
D.
UPDATE 成绩 SET 总成绩 = 卷面分*0.7+平时分*0.3 WHERE 课程号 = P002
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