SQL第二周

3、①查询Customer表中的所有图书的信息

Use BookStore
SELECT *
From Customer

②查询Customer表中所有客户的信息，要求显示CustomerCode、Name、Hometown和Telephone字段信息

Use BookStore
SELECT CustomerCode,Name,Hometown,Telephone
From Customer

③查询客户等级（VIPClass）为A的客户编号（CustomerCode）和评价时间（Evaluate Data），要求显示的字段标题分别为“客户编号”和评价时间

Use BookStore
SELECT CustomerCode AS ["客户编号"],EvaluateDate AS ["评价时间"]
From CustomerEvaluation
WHERE VIPClass = 'A'

④查询2009年出版的少儿类图书，要求显示图书名称、作者、出版时间、价格、折扣，并且字段标题分别为“图书名称”、“作者”、“出版时间”、“价格”、“折扣”

Use BookStore
SELECT BookName AS ["图书名称"],Author AS ["作者"],PublishTime AS["出版时间"],
Price AS ["价格"],Discount AS ["折扣"]
From Book
WHERE BookSort ='少儿' AND PublishTime IN ('2009') 

⑤

Use BookStore
SELECT DISTINCT BookSort From Book

⑥

Use BookStore
SELECT TOP 3 OrderCode,OrderTime,OrderStatus FROM Order

⑦

USE BookStore
SELECT OrderCode,TotalPrice,OrderTime,OrderStatus FROM Order
WHERE TotalPrice>100 AND TotalPrice<200

⑧查询出版社代号为03,、21、31的出版社出版的图书信息

USE BookStore
SELECT BookCode,BookName,Author,PublisherCode FROM Book
WHERE PublisherCode IN ('03','21','31')

⑨查询图书名称中含有“程序”的图书信息

USE BookStore
SELECT BookCode,BookName,Author,Price,Discount FROM Book
WHERE BookName LIKE '%程序%'

4.①显示图书名称、原价、折扣及打折后的价格，并显示一列“说明”：未享客户等级优惠

USE BookStore
SELECT BookName,Price,Discount,Price*Discount AS 折后价格,'未享客户等级优惠' AS 说明 FROM Book

②

USE BookStore
SELECT MAX(PRICE) AS 最高价,MIN(PRICE) AS 最低价,AVG(PRICE) AS 平均价,
MAX(PRICE)-MIN(PRICE) AS 最高价与最低价的差值
FROM Book

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这两问当时赶得急不会写

③查询销售总量为前20%的图书，并按总销量降序排列

USE BookStore
SELECT TOP 20 Percent Bookcode AS 书号,SUM(Amount) AS 总销量
From OrderDetail
GROUP BY Bookcode
Order by SUM(Amount) DESC

学习后仍会困惑GROUP BY的必要用处 

④

USE BookStore
SELECT BookName,Author  FROM Book
Where LEN(Author)>=8

题目之后也懒得补