数据库/头歌/添加常用约束/添加常用约束.sh

@@ -1,9 +0,0 @@
-sqlcmd -S localhost -U sa -P '<123123Aa!@>'
-CREATE DATABASE MyDb;
-go 
-
-USE MyDb;
-go
-
-CREATE TABLE t_user (id INT PRIMARY KEY IDENTITY(1,1), username VARCHAR(32) NOT NULL UNIQUE, sex INT DEFAULT 0);
-go

数据库/头歌/触发器的创建和使用/1. 触发器的创建和使用.sh

@@ -1,70 +0,0 @@
-USE studentdb
-go
-
-SET NOCOUNT ON 
-go
---********** create trigger_insert_score  **********--
---********** Begin **********--
-CREATE TRIGGER trigger_insert_score  
-ON score  
-INSTEAD OF INSERT  
-AS  
-BEGIN  
-    IF EXISTS (SELECT * FROM inserted i WHERE NOT EXISTS (SELECT 1 FROM student s WHERE s.sno = i.sno))  
-    BEGIN  
-        RETURN  
-    END  
-    INSERT INTO score (sno, cno, grade)  
-    SELECT sno, cno, grade FROM inserted  
-END  
---********** End **********--
-go
-delete from score
-go
-insert into score values('1001','2001','89.5')
-go
-insert into score values('1002','2001','95')
-go
-insert into score values('1011','2001','88')
-go
-select * from score
-go
-
-
---********** create trigger_delete_student  **********--
---********** Begin **********--
-CREATE TRIGGER trigger_delete_student  
-ON student  
-INSTEAD OF DELETE  
-AS  
-BEGIN  
-    DELETE FROM score WHERE sno IN (SELECT sno FROM deleted)  
-    DELETE FROM student WHERE sno IN (SELECT sno FROM deleted)  
-END  
---********** End **********--
-go
-delete from student where sno='1001'
-go
-select * from student
-go
-
---********** create trigger_protect_grade **********--
---********** Begin **********--
-CREATE TRIGGER trigger_protect_grade  
-ON score  
-FOR UPDATE  
-AS  
-BEGIN  
-    IF UPDATE(grade)  
-    BEGIN  
-        ROLLBACK TRANSACTION  
-    END  
-END  
---********** End **********--
-go
-delete from score where sno='1001'
-go
-select * from score
-go
-select * from student
-go