查询“图书”表中书名含有“计算机”的图书信息，正确的选项是______。 A: select * from book where bname like ‘_计算机_’ B: select * from book where bname like ‘_计算机%’ C: select * from book where bname like ‘%计算机_’ D: select * from book where bname like ‘%计算机%’

查询book表中每类图书的平均单价，结果只显示平均单价大于30的图书类别名和平均单价，以下SQL语句正确的是？ A: select 图书类别,avg(单价)from bookwhere 单价 >= avg(单价); B: select 图书类别,avg(单价)from bookgroup by 图书类别; C: select 图书类别,avg(单价)from bookgroup by 图书类别having avg(单价) > 30; D: select 图书类别,avg(单价)from bookgroup by 图书类别where avg(单价) > 30;

‍查询图书名称含有“程序”的图书信息。语句如下：‌‍‌SELECT BookCode, BookName, Author, Price, Discount‌FROM Book‌WHERE BookName LIKE ________‌

查询book表中price字段的最大值，查询语句是： A: select max(price) from book； B: select min(price) from book； C: select price from min book； D: select price from max book；

BookStore数据库中有图书表 Book(BookCode, BookName, Author, PublisherCode, PublishTime，BookSort, ISBN, BookPicture, ContentInro, Price, Discount) 查询图书名称（BookName）含有“程序”的图书信息。SQL语句: SELECT BookCode,BookName,Author,Price,Discount FROM Book WHERE Name=“%程序%”