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25. 设有关系SC（sno, cname, grade），各属性的含义分别为学号、课程名、成绩。若要将所有学生的“数据库系统”课程的成绩增加5分，能正确完成该操作的SQL语句是（ ）grade = grade 5 WHERE cname=“数据库系统”。
   A、Update
   B、Update SC set
   C、Update set
   D、Updated SC set
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