设Grade列目前有三个值：90、80和NULL，则AVG(Grade)

简答题设Grade列目前有三个值：90、80和NULL，则AVG(Grade)的值是_________，MIN(Grade)的值是_________。

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单选题设SC表中记录成绩的列为：Grade，类型为int。若在查询成绩时，希望将成绩按‘优’、‘良’、‘中’、‘及格’和‘不及格’形式显示，正确的Case函数是 C

A、Case Grade
When 90~100 THEN '优'
When 80~89 THEN '良'
When 70~79 THEN '中'
When 60~69 THEN '及格'
Else '不及格'
End

B、Case
When Grade between 90 and 100 THEN Grade = '优'
When Grade between 80 and 89 THEN Grade = '良'
When Grade between 70 and 79 THEN Grade = '中'
When Grade between 60 and 69 THEN Grade = '及格'
Else Grade = '不及格'
End

C、Case
When Grade between 90 and 100 THEN '优'
When Grade between 80 and 89 THEN '良'
When Grade between 70 and 79 THEN '中'
When Grade between 60 and 69 THEN '及格'
Else '不及格'
End

D、Case Grade
When 90~100 THEN Grade = '优'
When 80~89 THEN Grade = '良'
When 70~79 THEN Grade = '中'
When 60~69 THEN Grade = '及格'
Else Grade = '不及格'
End

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单选题下述语句的功能是将两个查询结果合并为一个结果。其中正确的是

A、select sno,sname,sage from student where sdept = 'cs'
Order by sage
Union
Select sno,sname,sage from student where sdept = 'is'
Order by sage

B、select sno,sname,sage from student where sdept = 'cs'
Union
Select sno,sname,sage from student where sdept = 'is'
Order by sage

C、select sno,sname,sage from student where sdept = 'cs'
Union
Select sno,sname from student where sdept = 'is'
Order by sage

D、select sno,sname,sage from student where sdept = 'cs'
Order by sage
Union
Select sno,sname,sage from student where sdept = 'is'

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单选题现要利用Student表查询年龄最小的学生姓名和年龄。下列实现此功能的查询语句中，正确的是

A、SELECT Sname, MIN(Sage) FROM Student

B、SELECT Sname, Sage FROM Student WHERE Sage = MIN(Sage)

C、SELECT TOP 1 Sname, Sage FROM Student