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【单选题】
How many finite verb phrases are there in the following sentence groups: With the appearance of mobile internet, shopping on phones has become a trend.The young men between 18 and 30 make up the biggest group of users in the mobile payment market.As the payment by phone is very easy,many consumers are willing to use phones to pay for shopping,but not willing to use cash or credit cards. To encourage people to buy more, many shops give discount to the customers who use mobile payment.A.
5
B.
6
C.
7
D.
8
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反馈参考答案：
举一反三
【简答题】temp1 的表,属性包括: xh char(4),xm varchar(10),sr date temp2 的表,属性包括: bh char(2),xb char(2) 要求: 修改表时用命 , 为 temp2 以 bh 建立主键。 。
【简答题】数据库表的表属性包括长表名与表注释、 __________ 、表的触发器。
【单选题】已知影片评论数据库包括如下表结构：Movie ( mID, title, year, director )影片表，属性包括影片编号，影片名，发行年份以及导演。Reviewer ( rID, name )评论者表，属性包括评论者编号，评论者姓名。Rating ( rID, mID, stars, ratingDate )评论表，属性包括评论者编号，影片编号，评分（1-5），评论日期。基于该数据库完成...
A.
select name from reviewer,rating where reviewer.rid=rating.rid group by reviewer.rid
B.
select name from reviewer,rating where reviewer.rid=rating.rid having stars>=3
C.
select name from reviewer,rating group by reviewer.rid having count(stars)>=3
D.
select name from reviewer,rating group by reviewer.rid where count(stars)>=3
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