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【单选题】
下列不属于社会福利特征的是（）A.
公平性
B.
服务性
C.
多样性
D.
统一性
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参考解析：
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皮皮学刷刷变学霸
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【简答题】音频信号的编码
【多选题】在bookshop数据库中有5 个表，这五个表的结构描述见“实验数据库描述”。其中员工表employee(emp_no,emp_name,sex,dept,title,date_hired,birthday,salary,telephone,addr)，客户表customer(cust_name,receiver,tel_no,cust_Addr)，图书表books(book_no,book_na...
A.
update sales set total_amt=total_amt*1.1 where cust_name in (select cust_name from customer where cust_name like '刘%')
B.
update sales set total_amt=total_amt*1.1 where cust_name = (select cust_name from customer where cust_name like '刘%')
C.
update sales set total_amt=total_amt*1.1 from customer,sales where sales.cust_name=customer.cust_name and customer.cust_name like '刘%'
D.
update sales set total_amt=total_amt*1.1 where exists (select * from customer where sales.cust_name=customer.cust_name and customer.cust_name like '刘%')
【多选题】在图书销售数据库bookshop中有5 个表,这五个表的结构描述见“实验数据库描述”。其中员工表employee(emp_no,emp_name,sex,dept,title,date_hired,birthday,salary,telephone,addr),客户表customer(cust_name,receiver,tel_no,cust_Addr),图书表books(book_no,boo...
A.
update sales set total_amt=total_amt*1.1 where cust_name in (select cust_name from customer where cust_name like '刘%')
B.
update sales set total_amt=total_amt*1.1 where exists (select * from customer where sales.cust_name=customer.cust_name and customer.cust_name like '刘%')
C.
update sales set total_amt=total_amt*1.1 where cust_name = (select cust_name from customer where cust_name like '刘%')
D.
update sales set total_amt=total_amt*1.1 from customer,sales where sales.cust_name=customer.cust_name and customer.cust_name like '刘%'
【简答题】统计每位客户订购的每种图书的总数量及平均单价，并按客户名，图书号从小到大排列。使用以下SQL语句实现：select customer.cust_name,sale_item.book_no ,sum(qty)总数量,sum(qty*unit_price)/sum(qty) 平均单价from sales,customer,sale_itemwhere sales.cust_name=customer...
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