MAX() 函数和 MIN() 函数的使用

数据库/头歌/MAX() 函数和 MIN() 函数的使用/1. MAX() 函数和 MIN() 函数的使用.sh

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+USE Mall
+GO
+
+SET NOCOUNT ON
+
+------ return the price of the least expensive item ------
+-- ********** Begin ********** --
+SELECT prod_name, prod_price
+FROM Products
+WHERE prod_price = (SELECT MIN(prod_price) FROM Products)
+-- ********** End ********** --
+
+GO
+
+

数据库/头歌/SUM() 函数的使用/1. SUM() 函数的使用.sh

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+USE Mall
+GO
+
+SET NOCOUNT ON
+
+------ return the amount of all products ------
+-- ********** Begin ********** --
+
+SELECT SUM(prod_price * quantity) as amount
+FROM Products
+
+-- ********** End ********** --
+
+GO
+
+

数据库/头歌/内连接查询/内连接查询.sh

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+USE Mall
+GO
+
+SET NOCOUNT ON
+
+--********** Begin **********--
+SELECT 
+    p.prod_id,
+    p.prod_name,
+    p.prod_price,
+    p.vend_id,
+    v.vend_name,
+    v.vend_phone
+FROM Products p
+INNER JOIN Vendors v
+ON p.vend_id = v.vend_id
+--********** End **********--
+
+GO

数据库/头歌/外连接查询/外连接查询.sh

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+USE Mall
+GO
+
+SET NOCOUNT ON
+
+--********** 左连接 **********--
+--********** Begin **********--
+SELECT p.prod_id, p.prod_name, p.prod_price, p.vend_id,
+       v.vend_id, v.vend_name, v.vend_phone
+FROM Products p LEFT JOIN Vendors v
+ON p.vend_id = v.vend_id;
+--********** End **********--
+
+--********** 右连接 **********--
+--********** Begin **********--
+SELECT p.prod_id, p.prod_name, p.prod_price, p.vend_id,
+       v.vend_id, v.vend_name, v.vend_phone
+FROM Products p RIGHT JOIN Vendors v
+ON p.vend_id = v.vend_id;
+--********** End **********--
+
+GO
+
+

数据库/头歌/带 WHERE 子句的多表查询/1. 带 WHERE 子句的多表查询.sh

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+USE Mall
+GO
+
+SET NOCOUNT ON
+
+--********** Begin **********--
+SELECT p.prod_id, p.prod_name, p.prod_price, p.vend_id,
+       v.vend_id, v.vend_name, v.vend_phone
+FROM Products p, Vendors v
+WHERE p.vend_id = v.vend_id
+--********** End **********--
+
+GO
+
+

数据库/头歌/视图的创建和使用/1. 数据库视图的创建和使用.sh

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+USE studentdb
+go
+
+SET NOCOUNT ON 
+go
+
+--********** create score_view_cdept **********--
+--********** Begin **********--
+CREATE VIEW score_view_cdept AS
+SELECT s.sno, s.name, c.cname, sc.grade
+FROM Student s
+JOIN Score sc ON s.sno = sc.sno
+JOIN Course c ON sc.cno = c.cno;
+--********** End **********--
+go
+
+
+