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已知关系:STUDENT(sno,sname,grade),以下关于命令 “CREATE CLUSTER INDEX s_index ON student (grade)” 的描述中,正确的是( ...

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SELECT sno FROM S WHERE sname="数据库"AN grade=MAX(grade)  SELECT sno FROM S FOR sname="数据库"OR grade>MAX(grade)  SELECT sno FROM S WHERE shame="数据库"AN grade=(SELECT MAX(grade)FROM sc)  SELECT son FROM S FOR sname="数据库"OR grade=(SELECT MAX(grade. FROM sc)  
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