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%,能正确完成该操作的SQL语句是( )。 A: UPDATE SET SC grade = grade*1.05 WHERE cname= '数据库系统' B: UPDATE SC SET grade = grade*0.05 WHERE cname= '数据库系统' C: UPDATE SC grade = grade+5 WHERE cname= '数据库系统' D: UPDATE SC SET grade = grade*1.05 WHERE cname= '数据库系统'

设关系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“数据库技术”课程的成绩加5分，能正确完成该操作的SQL语句是 __ grade=grade+5 WHERE cname=’数据库技术’。

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“数据库技术”课程的成绩增加5分，能正确完成该操作的SQL语句是___1___grade = grade+5 WHERE cname=‘数据库技术’。

The most common division between primary and secondary education in the US is ___________.（ ） A: primary schools (Grade 1 to Grade 6) and middle schools (Grade 7 to Grade 12) B: elementary schools (Grade Kindergarten to Grade 8) and high schools (Grade 9 to Grade 12) C: elementary schools (Grade Kindergarten to Grade 3), middle schools (Grade 4 to Grade 6) and high schools (Grade 7 to Grade 12) D: grammar schools (Grade Kindergarten to Grade 6) and high schools (Grade 7 to Grade 12)

The average distribution grade of iron in the earth's crush is 5%, and it has no mining value.

Which grade were they in? A: Grade 8 B: Grade 9 C: Grade 10 D: Grade 11

【单选题】5. 假定student表中有字段grade,grade代表分数,依次统计grade字段的最大值,最小值,平均值的SQL语句是 A. SELECT max(grade),min(grade),average(grade) FROM student; B. SELECT max(grade),min(grade),avg(grade) FROM student; C. SELECT min(grade),average(grade),max(grade) FROM student; D. SELECT min(grade),avg(grade),max(grade) FROM student;

What grade is the woman in A: Grade one. B: Grade two. C: Grade three.

They are the students of ______. A: grade 7 B: Grade 7 C: 7th grade D: Grade 7th

The average distribution grade of iron in the earth's crush is 5%, and it has no mining value. A: 正确 B: 错误