下列选项中，哪个可以正确地将表名tb_grade修改为grade

下列选项中,哪个可以正确地将表名tb_grade修改为grade A: ALTERTABLEgradeRENAMETOtb_grade; B: ALTERTABLEtb_gradeRENAMETOgrade; C: ALTERTABLEtb_gradeRENAMEgrade; D: ShowCREATETABLE表名

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)

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

高速铁路钢轨应符合（）规定。 A: TB/T3276 B: TB/T3200 C: TB/T3222 D: TB/T3232

查询统计选课表SC中成绩列Grade的最小值，可以用_______函数。 A: Min(Grade) B: Max(Grade) C: Avg(Grade) D: Sum(Grade)

查询统计选课表SC中成绩列Grade的平均值，可以用_______函数。 A: Sum(Grade) B: Avg(Grade) C: Min(Grade) D: Max(Grade)