【单选题】BookStore数据库中有销售明细表OrderDetail(OrderCode, BookCode, Amount) 销售总量前20%的图书,并按总销量降序排列。SQL语句: SELECT TOP 20 PERCENT Bookcode As 书号, SUM(Amount)As总销量 FROM OrderDetail GROUP BY Bookcode ORDER BY ________
【单选题】BookStore 数据库中有销售明细表 OrderDetail(OrderCode, BookCode, Amount) 查询销售总量前 20% 的图书,并按总销量降序排列。 SQL 语句: SELECT TOP 20 PERCENT Bookcode As 书号 , SUM(Amount)As 总销量 ROM OrderDetail GROUP BY Bookcode ORDER BY ___...