题目内容

Which ones of the following expressions can be used to describe the technology of a product?

A. prime quality
B. fine workmanship
C. skillful manufacture
D. with traditional methods

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Which ones of the following expressions can be used to describe the quality of a product?

A. first-class quality
B. reliable quality
C. easy to handle
D. long performance life

Which ones of the following words can be used to describe the price of a product?

A. reasonable
B. competitive
C. moderate
D. favorable

Which ones of the following phrases are describing the warranty of a product?

A. a full refund against the invoice
B. 3-year's after-sale service
C. free door-to-door service
D. a wide varieties to choose from

在学生管理数据库(SMD)中有以下关系：Student(Sno,Sname,Ssex,Sage,Clno)，Course(Cno,Cname,Credit），SC(Sno,Cno,Score)。对应的中文表达：学生(学号,姓名,性别,年龄,班级号），Course(课程号,课程名，学分），选课(学号,课程号,成绩)。用SQL语句完成下列查询。（1）查询所有年龄为20岁的男生的信息。（2）查询选修00001号课程的学生的最高分。（3）查询所有名字中含有“王”字的学生的信息。（4）查询本学期正在选修00003号课程的学生的学号。（5）查询每位学生的学号和平均成绩，并按照平均成绩降序排。（6）查询每位学生的学号、课程号和成绩，同时将每个班的平均成绩汇总出来，并按照班级号升序排。