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单项选择题
A.Update grade set score=score+5 where score in 55..60
B.Update grade set score=score+5 where score >=55 AND score <=60
C.Update grade set score=score+5 where score between 55 or 60
D.Update grade set score=score+5 where score <=55 and score >=60
单项选择题
A.创建一个DEFAULT约束(或默认值)
B.创建一个CHECK约束
C.创建一个UNIQUE约束(或唯一值)
D.创建一个PRIMAR YKEY约束(或主键)