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数据库原理及应用-李唯唯主编-实验3-2

2023-10-21 19:40

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实验3-2

一、实验目的与要求

  1. 掌握单表查询
  2. 掌握多表连接查询
  3. 掌握子查询、集合查询。
  4. 掌握派生表查询。
  5. 掌握聚合函数使用方法

二、实验内容

  1. 实验平台:
    • 操作系统:windows11
    • 数据库:MySQL8
    • 数据库管理平台:Navicat Premium 15
  2. 在数据库supermarket上完成下列操作
    1. 查询商品种类信息。
    2. 查询IT专业所有学生信息。
    3. 查询MIS专业年龄小于20岁的学生信息。并为MIS列取别名为 “信息管理系统”
    4. 查询利润率大于30%的商品编号与商品名。
    5. 查询广州佛山供应的商品信息。
    6. 查询购买了商品种类为咖啡的MIS专业的学生信息。
    7. 查询购买了商品种类为咖啡的各专业的学生人数。
    8. 查询购买各商品种类的各专业的学生人数。
    9. 查询从未购买过商品的学生信息。
    10. 查询与商品编号GN0005相同产地的商品编号、商品名。
    11. 使用派生表查询各供应商的存货量。
    12. 查询售价大于该种类商品售价均值的商品号、商品名。
    13. 分别用子查询 与 连接查询查询购买了商品编号为 “GN0003” 和"GN0007"的学生学号与姓名。
    14. 查询各校销售额。
    15. 查询购买额前三的校名、专业名。
    16. 使用集合查询方式查询生产日期早于2018-1-1 或 库存量小于30的商品信息。

三、实验过程、步骤及结果

  1. 题目:查询商品种类信息

    • 代码:

      -- 实验3-2-- 1. 查询商品种类信息。-- 方法一SELECT * FROM category;-- 方法二SELECT CategoryNO 编号,CategoryName 种类,Description 具体描述 FROM category;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-BblEH3J7-1665624066603)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161526838.png)]


  2. 题目:查询IT专业所有学生信息

    • 代码:

      -- 2. 查询IT专业所有学生信息。-- 方法一SELECT * FROM student WHERE Major = 'IT';-- 方法二SELECT SNO 学号,SName 姓名,BirthYear 出生年份,Ssex 性别,College 学院,Major 专业,WeiXin 专业 FROM student WHERE Major = 'IT';
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GGWM1ikz-1665624066604)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161543809.png)]


  3. 题目:查询MIS专业年龄小于20岁的学生信息。并为MIS列取别名为 “信息管理系统”

    • 代码:

      -- 3. 查询MIS专业且年龄小于20岁的学生信息。并为MIS列取别名为 "信息管理系统"。-- 第一次查询不到信息,因为这里的BirthYear不是date类型,而是int,类型,所以直接减就行了SELECT * FROM student WHERE Major = 'MIS' AND (YEAR(NOW())-YEAR(BirthYear)) > 20;-- 第一次查询不到信息,因为这里的BirthYear都已经超过了20岁,所以找不到满足条件的,因此查询MIS专业且年龄大于20岁的学生信息-- 方法一:查询MIS专业且年龄小于20岁的学生信息SELECT * FROM student WHERE Major = 'MIS' AND (YEAR(NOW())-BirthYear) < 20;-- 方法二:查询MIS专业且年龄大于20岁的学生信息SELECT SNO 学号,SName 姓名,BirthYear 出生年份,(YEAR(NOW())-BirthYear) 年龄,Ssex 性别,College 学院,Major 专业,WeiXin 专业 FROM student WHERE Major = 'MIS' AND (YEAR(NOW())-BirthYear) > 20;-- 方法二SELECT SNO 学号,SName 姓名,BirthYear 出生年份,Ssex 性别,College 学院,Major 专业,WeiXin 专业 FROM student WHERE Major = 'IT';
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-gf5ntqBy-1665624066604)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161617075.png)][外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GYUeu6Yd-1665624066605)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161632448.png)]


  4. 题目:查询利润率大于30%的商品编号与商品名

    • 代码:

      -- 4. 查询利润率大于30%的商品编号与商品名。-- SELECT * FROM goods WHERE (SalePrice-InPrice)/InPrice < 0.3;SELECT GoodsNO 商品编号,GoodsName 商品名,ROUND((SalePrice-InPrice)/InPrice,2) AS 利润率 FROM goods WHERE (SalePrice-InPrice)/InPrice < 0.3;SELECT GoodsNO 商品编号,GoodsName 商品名,ROUND((SalePrice-InPrice)/InPrice,2) AS 利润率 FROM goods WHERE (SalePrice-InPrice)/InPrice > 0.3;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-loYhYfgu-1665624066605)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161901957.png)][外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-d7jvMRkU-1665624066605)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161913598.png)]


  5. 题目:查询广州佛山供应的商品信息

    • 代码:

      -- 5. 查询广州佛山供应的商品信息。SELECT g.GoodsNO 商品编号,s.SupplierNO 供应商编号,g.CategoryNO 商品种类编号,g.GoodsName 商品名,s.Address 供应商,s.SupplierName 公司  FROM goods gLEFT JOIN supplier s ON g.SupplierNO = s.SupplierNOWHERE s.Address = '广州佛山';
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-4Z9XxBR0-1665624066605)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161941446.png)]


  6. 题目:查询购买了商品种类为咖啡的MIS专业的学生信息

    • 代码:

      -- 6. 查询购买了商品种类为咖啡的MIS专业的学生信息。-- 方法一:使用子查询语句SELECT * FROM student st WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOWHERE c.CategoryName = '咖啡')) AND Major = 'MIS'-- 方法2:使用左右外连接SELECT DISTINCT st.SNO,st.SName,st.BirthYear,st.Ssex,st.College,st.Major,st.WeiXin FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOLEFT JOIN salebill s ON s.GoodsNO = g.GoodsNOLEFT JOIN student st ON st.SNO = s.SNOWHERE c.CategoryName = '咖啡' AND st.Major='MIS';
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-KENkiepN-1665624066606)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012161959760.png)]


  7. 题目:查询购买了商品种类为咖啡的各专业的学生人数

    • 代码:

      -- 7. 查询购买了商品种类为咖啡的各专业的学生人数。-- 方法一:使用子查询语句SELECT Major 专业,COUNT(Major) 人数 FROM student st WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOWHERE c.CategoryName = '咖啡'))  GROUP BY Major;-- 方法二:使用左右外连接SELECT sc.Major 专业,COUNT(sc.Major) 人数 FROM student stRIGHT JOIN (SELECT DISTINCT st.SNO,st.SName,st.BirthYear,st.Ssex,st.College,st.Major,st.WeiXin FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOLEFT JOIN salebill s ON s.GoodsNO = g.GoodsNOright JOIN student st ON st.SNO = s.SNOWHERE c.CategoryName = '咖啡') sc ON st.SNO = sc.SNOGROUP BY sc.Major;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-k5V5FlzD-1665624066606)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012162027303.png)]


  8. 题目: 查询购买各商品种类的各专业的学生人数

    • 代码:

      -- 8. 查询购买各商品种类的各专业的学生人数。-- 方法一:使用子查询语句SELECT Major,COUNT(Major) FROM student WHERE SNO IN (SELECT DISTINCT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM goods WHERE CategoryNO IN (SELECT CategoryNO FROM category)))GROUP BY Major;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-B5lFf5wK-1665624066606)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012162056489.png)]


  9. 题目:查询从未购买过商品的学生信息

    • 代码:

      -- 9. 查询从未购买过商品的学生信息。-- 方法一:使用子查询语句SELECT * FROM student WHERE SNO NOT IN (SELECT DISTINCT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM goods WHERE CategoryNO IN (SELECT CategoryNO FROM category)));
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-8D1HWQ3o-1665624066607)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012162116300.png)]


  10. 题目: 查询与商品编号GN0005相同产地的商品编号、商品名

    • 代码:

      -- 10. 查询与商品编号GN0005相同产地的商品编号、商品名。-- 第一步:查询到商品编号GN0005商品的产地SELECT Address FROM goods gLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNOWHERE g.GoodsNO = 'GN0005';-- 第二步:根据商品的产地查询到供应商的编号SELECT SupplierNO FROMsupplierWHERE Address = (SELECT Address FROM goods gLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNOWHERE g.GoodsNO = 'GN0005')-- 第三步:使用子查询SELECT * FROM goods WHERE SupplierNO IN(SELECT SupplierNO FROM supplier WHERE Address = (SELECT Address FROM goods gLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNOWHERE g.GoodsNO = 'GN0005'))
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-IKOs1FdJ-1665624066607)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012162446667.png)]


  11. 题目:使用派生表查询各供应商的存货量

    • 代码:

      -- 11. 使用派生表查询各供应商的存货量。SELECT sp.SupplierNO 供应商编号,sp.SupplierName 供应商名称,sg.sum_number 存货量 FROM supplier spLEFT JOIN (SELECT SupplierNO,SUM(Number) sum_number FROM goods GROUP BY SupplierNO) sgON sp.SupplierNO = sg.SupplierNO;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-xPiwk85n-1665624066609)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012164131110.png)]


  12. 题目:查询售价大于该种类商品售价均值的商品号、商品名

    • 代码:

      -- 12. 查询售价大于该种类商品售价均值的商品号、商品名。-- 第一步:按种类分组求平均售价(保留小数点后两位)SELECT CategoryNO,(ROUND(AVG(SalePrice),2)) avg_saleprice FROM goodsGROUP BY CategoryNO;SELECT g.GoodsNO 商品编号,g.SupplierNO 供应商编号, sg.CategoryNO 商品种类编号,g.GoodsName 商品名,g.SalePrice 售价,sg.avg_saleprice 该类商品的平均售价 FROM goods gright JOIN (SELECTCategoryNO,ROUND(AVG( SalePrice ),2) avg_saleprice FROMgoods GROUP BYCategoryNO) sgON g.CategoryNO = sg.CategoryNO AND g.SalePrice > sg.avg_saleprice;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-J7F2yrRB-1665624066609)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012165213442.png)]


  13. 题目:分别用子查询 与 连接查询查询购买了商品编号为 “GN0003” 和"GN0007"的学生学号与姓名

    • 代码:

      -- 13. 分别用子查询 与 连接查询查询购买了商品编号为 "GN0003" 和"GN0007"的学生学号与姓名。-- 方法一:使用子查询SELECT SNO,SName FROM student WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007')SELECT SNO,SName FROM student WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007' GROUP BY SNO HAVING COUNT(GoodsNO) = 2)-- 方法二:使用连接查询SELECT st.SNO,st.SName FROM student stRIGHT JOIN ( SELECT DISTINCT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007') gON st.SNO = g.SNOORDER BY st.SNO ASCSELECT st.SNO,st.SName FROM student stRIGHT JOIN ( SELECT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007' GROUP BY SNO HAVING COUNT(GoodsNO) = 2) gON st.SNO = g.SNOORDER BY st.SNO ASC
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-xGm3rgJ9-1665624066610)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221012170149140.png)][外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-u5EpgkEm-1665624066610)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221013084331224.png)]


  14. 题目:查询各校销售额

    • 代码:

      -- 14. 查询各校销售额。-- 第一步:计算各个学生的销售额SELECT s.SNO s_SNO ,SUM((s.Number*g.SalePrice)) sum_number_price FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO;-- 第二步:计算各校的销售数量SELECT st.College 学校,SUM(sg.sum_number_price) 销售额FROM student stLEFT JOIN (SELECT s.SNO s_SNO ,SUM((s.Number*g.SalePrice)) sum_number_price FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO) sgON st.SNO = sg.s_SNOGROUP BY College;-- 14. 查询各公司销售额。-- 第一步:计算各类商品的销售数量SELECT GoodsNO,SUM(Number) sum_number FROM salebillGROUP BY GoodsNO;SELECT sg.GoodsNO,g.GoodsName,sp.SupplierName 公司,g.SalePrice*sg.sum_number 销售额 FROM goods gRIGHT JOIN (SELECT GoodsNO,SUM(Number) sum_number FROM salebillGROUP BY GoodsNO) sgON g.GoodsNO = sg.GoodsNOLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNO;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-UvHxMooL-1665624066611)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221013084042608.png)][外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hCFUwgIX-1665624066612)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221013084133433.png)]


  15. 题目:查询销售额、购买额前三的校名、专业名

    • 代码:

      -- 15. 查询销售额、购买额前三的校名、专业名。SELECT st.College 学校,Major 专业名,SUM(sg.sum_number_price) 销售额FROM student stLEFT JOIN (SELECT s.SNO s_SNO ,SUM((s.Number*g.SalePrice)) sum_number_price FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO) sgON st.SNO = sg.s_SNOGROUP BY College,MajorORDER BY Major DESCLIMIT 0,3;SELECT st.College 学校,Major 专业名,SUM(sg.sum_number) 购买额FROM student stLEFT JOIN (SELECT s.SNO s_SNO ,SUM(s.Number) sum_number FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO) sgON st.SNO = sg.s_SNOGROUP BY College,MajorORDER BY Major DESCLIMIT 0,3;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hBuQt7OR-1665624066612)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221013083645807.png)][外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-6isjtRii-1665624066613)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221013084011868.png)]


  16. 题目:使用集合查询方式查询生产日期早于2018-1-1 或 库存量小于30的商品信息

    • 代码:

      -- 16. 使用集合查询方式查询生产日期早于2018-1-1 或 库存量小于30的商品信息。-- 方法一:使用unionSELECT * FROM goods WHERE DATEDIFF(DATE(ProductTime),'2018-1-1') < 0UNIONSELECT * FROM goods WHERE QGPeriod < 30;-- SELECT GoodsNO,SupplierNO,CategoryNO,GoodsName,InPrice,SalePrice,Number,ProductTime 生产日期,QGPeriod 库存,DATEDIFF(DATE(ProductTime),'2018-1-1') 日期差  FROM goods WHERE DATEDIFF(DATE(ProductTime),'2018-1-1') < 0 OR QGPeriod < 30;
    • 效果图:[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-7u2WB6Dm-1665624066613)(C:\Users\SayHello\AppData\Roaming\Typora\typora-user-images\image-20221013083624345.png)]

四、具体查询

-- 实验3-2-- 1. 查询商品种类信息。-- 方法一SELECT * FROM category;-- 方法二SELECT CategoryNO 编号,CategoryName 种类,Description 具体描述 FROM category;-- 2. 查询IT专业所有学生信息。-- 方法一SELECT * FROM student WHERE Major = 'IT';-- 方法二SELECT SNO 学号,SName 姓名,BirthYear 出生年份,Ssex 性别,College 学院,Major 专业,WeiXin 专业 FROM student WHERE Major = 'IT';-- 3. 查询MIS专业且年龄小于20岁的学生信息。并为MIS列取别名为 "信息管理系统"。-- 第一次查询不到信息,因为这里的BirthYear不是date类型,而是int,类型,所以直接减就行了SELECT * FROM student WHERE Major = 'MIS' AND (YEAR(NOW())-YEAR(BirthYear)) > 20;-- 第一次查询不到信息,因为这里的BirthYear都已经超过了20岁,所以找不到满足条件的,因此查询MIS专业且年龄大于20岁的学生信息-- 方法一:查询MIS专业且年龄小于20岁的学生信息SELECT * FROM student WHERE Major = 'MIS' AND (YEAR(NOW())-BirthYear) < 20;-- 方法二:查询MIS专业且年龄大于20岁的学生信息SELECT SNO 学号,SName 姓名,BirthYear 出生年份,(YEAR(NOW())-BirthYear) 年龄,Ssex 性别,College 学院,Major 专业,WeiXin 专业 FROM student WHERE Major = 'MIS' AND (YEAR(NOW())-BirthYear) > 20;-- 4. 查询利润率大于30%的商品编号与商品名。-- SELECT * FROM goods WHERE (SalePrice-InPrice)/InPrice < 0.3;SELECT GoodsNO 商品编号,GoodsName 商品名,ROUND((SalePrice-InPrice)/InPrice,2) AS 利润率 FROM goods WHERE (SalePrice-InPrice)/InPrice < 0.3;SELECT GoodsNO 商品编号,GoodsName 商品名,ROUND((SalePrice-InPrice)/InPrice,2) AS 利润率 FROM goods WHERE (SalePrice-InPrice)/InPrice > 0.3;-- 5. 查询广州佛山供应的商品信息。SELECT g.GoodsNO 商品编号,s.SupplierNO 供应商编号,g.CategoryNO 商品种类编号,g.GoodsName 商品名,s.Address 供应商,s.SupplierName 公司  FROM goods gLEFT JOIN supplier s ON g.SupplierNO = s.SupplierNOWHERE s.Address = '广州佛山';-- 6. 查询购买了商品种类为咖啡的MIS专业的学生信息。-- 方法一:使用子查询语句SELECT * FROM student st WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOWHERE c.CategoryName = '咖啡')) AND Major = 'MIS'-- 方法2:使用左右外连接SELECT DISTINCT st.SNO,st.SName,st.BirthYear,st.Ssex,st.College,st.Major,st.WeiXin FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOLEFT JOIN salebill s ON s.GoodsNO = g.GoodsNOLEFT JOIN student st ON st.SNO = s.SNOWHERE c.CategoryName = '咖啡' AND st.Major='MIS';-- 7. 查询购买了商品种类为咖啡的各专业的学生人数。-- 方法一:使用子查询语句SELECT Major 专业,COUNT(Major) 人数 FROM student st WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOWHERE c.CategoryName = '咖啡'))  GROUP BY Major;-- 方法二:使用左右外连接SELECT sc.Major 专业,COUNT(sc.Major) 人数 FROM student stRIGHT JOIN (SELECT DISTINCT st.SNO,st.SName,st.BirthYear,st.Ssex,st.College,st.Major,st.WeiXin FROM category cLEFT JOIN goods g ON c.CategoryNO = g.CategoryNOLEFT JOIN salebill s ON s.GoodsNO = g.GoodsNOright JOIN student st ON st.SNO = s.SNOWHERE c.CategoryName = '咖啡') sc ON st.SNO = sc.SNOGROUP BY sc.Major;-- 8. 查询购买各商品种类的各专业的学生人数。-- 方法一:使用子查询语句SELECT Major,COUNT(Major) FROM student WHERE SNO IN (SELECT DISTINCT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM goods WHERE CategoryNO IN (SELECT CategoryNO FROM category)))GROUP BY Major;-- 9. 查询从未购买过商品的学生信息。-- 方法一:使用子查询语句SELECT * FROM student WHERE SNO NOT IN (SELECT DISTINCT SNO FROM salebill WHERE GoodsNO IN (SELECT GoodsNO FROM goods WHERE CategoryNO IN (SELECT CategoryNO FROM category)));-- 10. 查询与商品编号GN0005相同产地的商品编号、商品名。-- 第一步:查询到商品编号GN0005商品的产地SELECT Address FROM goods gLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNOWHERE g.GoodsNO = 'GN0005';-- 第二步:根据商品的产地查询到供应商的编号SELECT SupplierNO FROMsupplierWHERE Address = (SELECT Address FROM goods gLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNOWHERE g.GoodsNO = 'GN0005')-- 第三步:使用子查询SELECT * FROM goods WHERE SupplierNO IN(SELECT SupplierNO FROM supplier WHERE Address = (SELECT Address FROM goods gLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNOWHERE g.GoodsNO = 'GN0005'))-- 11. 使用派生表查询各供应商的存货量。SELECT sp.SupplierNO 供应商编号,sp.SupplierName 供应商名称,sg.sum_number 存货量 FROM supplier spLEFT JOIN (SELECT SupplierNO,SUM(Number) sum_number FROM goods GROUP BY SupplierNO) sgON sp.SupplierNO = sg.SupplierNO;-- 12. 查询售价大于该种类商品售价均值的商品号、商品名。-- 第一步:按种类分组求平均售价(保留小数点后两位)SELECT CategoryNO,(ROUND(AVG(SalePrice),2)) avg_saleprice FROM goodsGROUP BY CategoryNO;SELECT g.GoodsNO 商品编号,g.SupplierNO 供应商编号, sg.CategoryNO 商品种类编号,g.GoodsName 商品名,g.SalePrice 售价,sg.avg_saleprice 该类商品的平均售价 FROM goods gright JOIN (SELECTCategoryNO,ROUND(AVG( SalePrice ),2) avg_saleprice FROMgoods GROUP BYCategoryNO) sgON g.CategoryNO = sg.CategoryNO AND g.SalePrice > sg.avg_saleprice;-- 13. 分别用子查询 与 连接查询查询购买了商品编号为 "GN0003" 和"GN0007"的学生学号与姓名。-- 方法一:使用子查询SELECT SNO,SName FROM student WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007')SELECT SNO,SName FROM student WHERE SNO IN(SELECT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007' GROUP BY SNO HAVING COUNT(GoodsNO) = 2)-- 方法二:使用连接查询SELECT st.SNO,st.SName FROM student stRIGHT JOIN ( SELECT DISTINCT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007') gON st.SNO = g.SNOORDER BY st.SNO ASCSELECT st.SNO,st.SName FROM student stRIGHT JOIN ( SELECT SNO FROM salebill WHERE GoodsNO = 'GN0003' OR GoodsNO = 'GN0007' GROUP BY SNO HAVING COUNT(GoodsNO) = 2) gON st.SNO = g.SNOORDER BY st.SNO ASC-- 14. 查询各校销售额。-- 第一步:计算各个学生的销售额SELECT s.SNO s_SNO ,SUM((s.Number*g.SalePrice)) sum_number_price FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO;-- 第二步:计算各校的销售数量SELECT st.College 学校,SUM(sg.sum_number_price) 销售额FROM student stLEFT JOIN (SELECT s.SNO s_SNO ,SUM((s.Number*g.SalePrice)) sum_number_price FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO) sgON st.SNO = sg.s_SNOGROUP BY College;SELECT GoodsNO,SUM(Number) sum_number FROM salebillGROUP BY GoodsNO;SELECT sg.GoodsNO,g.GoodsName,sp.SupplierName 公司,g.SalePrice*sg.sum_number 销售额 FROM goods gRIGHT JOIN (SELECT GoodsNO,SUM(Number) sum_number FROM salebillGROUP BY GoodsNO) sgON g.GoodsNO = sg.GoodsNOLEFT JOIN supplier sp ON g.SupplierNO = sp.SupplierNO;-- 15. 查询销售额、购买额前三的校名、专业名。SELECT st.College 学校,Major 专业名,SUM(sg.sum_number_price) 销售额FROM student stLEFT JOIN (SELECT s.SNO s_SNO ,SUM((s.Number*g.SalePrice)) sum_number_price FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO) sgON st.SNO = sg.s_SNOGROUP BY College,MajorORDER BY Major DESCLIMIT 0,3;SELECT st.College 学校,Major 专业名,SUM(sg.sum_number) 购买额FROM student stLEFT JOIN (SELECT s.SNO s_SNO ,SUM(s.Number) sum_number FROM salebill s LEFT JOIN goods g ON s.GoodsNO = g.GoodsNO GROUP BY SNO) sgON st.SNO = sg.s_SNOGROUP BY College,MajorORDER BY Major DESCLIMIT 0,3;-- 16. 使用集合查询方式查询生产日期早于2018-1-1 或 库存量小于30的商品信息。-- 方法一:使用unionSELECT * FROM goods WHERE DATEDIFF(DATE(ProductTime),'2018-1-1') < 0UNIONSELECT * FROM goods WHERE QGPeriod < 30;-- SELECT GoodsNO,SupplierNO,CategoryNO,GoodsName,InPrice,SalePrice,Number,ProductTime 生产日期,QGPeriod 库存,DATEDIFF(DATE(ProductTime),'2018-1-1') 日期差  FROM goods WHERE DATEDIFF(DATE(ProductTime),'2018-1-1') < 0 OR QGPeriod < 30;

数据库文件:>
supermarket.sql
https://www.aliyundrive.com/s/hmXsCqZJHN3
提取码: 4rx3
点击链接保存,或者复制本段内容,打开「阿里云盘」APP ,无需下载极速在线查看,视频原画倍速播放。

查询语句文件:>
实验3-2.sql
https://www.aliyundrive.com/s/vshDT2MhVnG
提取码: 3x1e
点击链接保存,或者复制本段内容,打开「阿里云盘」APP ,无需下载极速在线查看,视频原画倍速播放。

五、实验总结

  1. 综合考查了对数据库表的查询的DML语句,单表查询、多表联查的使用
  2. 综合考查了子查询语句、集合查询、派生查询的具体应用
  3. 综合考查了聚合函数、分组查询、limit子句的知识

来源地址:https://blog.csdn.net/qq_45659753/article/details/127294788

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