现有书目表book，包含字段：价格price（float），类别type（char）；现在查询各个类别的平均价格、类别名称，以下语句正确的是（）。A、select avg（price），type from book group by typeB、select count（price），type from book group by priceC、select avg（price），type from book group by priceD、select count（price），type from book group by type
现有书目表book，包含字段：价格price（float），类别type（char）；现在查询各个类别的平均价格、类别名称，以下语句正确的是（）。
- A、select avg（price），type from book group by type
- B、select count（price），type from book group by price
- C、select avg（price），type from book group by price
- D、select count（price），type from book group by type
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单选题现有书目表book，包含字段：价格price（float），类别type（char）；现在查询各个类别的平均价格、类别名称，以下语句正确的是（）。Aselect avg（price），type from book group by typeBselect count（price），type from book group by priceCselect avg（price），type from book group by priceDselect count（price），type from book group by type
多选题现有书目表book，包含字段：price（float）；现在查询一条书价最高的书目的详细信息，以下语句正确的是（）Aselect top 1 * from book order by price ascBselect top 1 * from book order by price descCselect top 1 * from book where price= (select max (price)from book)Dselect top 1 * from book where price= max(price)
单选题现有书目表book，包含字段：price（float）；现在查询一条书价最高的书目的详细信息，以下语句正确的是（）。Aselect top1*from book order by price ascBselect top1*from book order by price descCselect top1*from book where priceDselect top1*from book where price=max（price）
单选题下面SQL语句都使用了聚合函数，其中选项（）存在错误。ASELECT MIN(au_lname) FROM authorsBSELECT ADD(ytd_sales+1) FROM titlesCSELECT type,MAX(price) FROM titles GROUP BY type ORDER BY typeDSELECT COUNT(*) ,avg(price) FROM titles WHERE advance $1000
单选题要查询book表中所有书名中以“计算机”开头的书籍的价格，可用（）语句。ASELECT price FROM book WHERE book_name=‘计算机*’BSELECT price FROM book WHERE book_nameLIKE‘计算机*’CSELECT price FROM book WHERE book_name=‘计算机%’DSELECT price FROM book WHERE book_nameLIKE‘计算机%’
单选题如果要查询book表中所有书名以“数据库”开头的书籍价格，下列（）语句是正确的。ASELECT price FROM book WHERE book_name＝“数据库*”BSELECT price FROM book WHERE book_name LIKE“数据库*”CSELECT price FROM book WHERE book_name＝“数据库%”DSELECT price FROM book WHERE book_name LIKE“数据库%”