【數據庫實驗】SQL代碼彙總

 

新建表，填寫信息。

 

DROP TABLE IF EXISTS SC
DROP TABLE IF EXISTS Student
DROP TABLE IF EXISTS Course
DROP TABLE IF EXISTS SysUser
DROP TABLE IF EXISTS SyUser
DROP TABLE IF EXISTS SysLog

CREATE TABLE SysUser          
 (	
 UserID NCHAR(20) PRIMARY KEY,                          
 UserPassWord NCHAR(32) ,             
 UserSchoolID NCHAR(20),
 UserMobile NCHAR(11),
 UserBirthday datetime,
 UserIdentity NCHAR(20),
 UserPhoto image
 ); 
CREATE TABLE SyUser          
 (	
 UserID NCHAR(20) PRIMARY KEY,                          
 UserPassWord NCHAR(32) ,             
 UserSchoolID NCHAR(20),
 UserMobile NCHAR(11),
 UserBirthday datetime,
 UserIdentity NCHAR(20),
 UserPhoto image
 ); 

 CREATE TABLE SysLog          
 (	
 UserID NCHAR(20) ,                          
 DateAndTime datetime,
 UserOperation NCHAR(200)
 ); 

CREATE TABLE Student          
 (	
 Sno CHAR(9) PRIMARY KEY,        /* 列級完整性約束條件,Sno是主碼*/                  
 Sname CHAR(20) UNIQUE,             /* Sname取唯一值*/
 Ssex CHAR(2),
 Sage SMALLINT,
 Sdept CHAR(20)
 ); 

CREATE TABLE  Course
 (	
 Cno CHAR(4) PRIMARY KEY,
 Cname CHAR(40),            
 Cpno CHAR(4),               	                      
 Ccredit SMALLINT,
 FOREIGN KEY (Cpno) REFERENCES  Course(Cno) 
 ); 

CREATE TABLE  SC
 (
 Sno CHAR(9), 
 Cno CHAR(4),  
 Grade SMALLINT,
 PRIMARY KEY (Sno,Cno),                     /* 主碼由兩個屬性構成，必須作爲表級完整性進行定義*/
 FOREIGN KEY (Sno) REFERENCES Student(Sno),  /* 表級完整性約束條件，Sno是外碼，被參照表是Student */
 FOREIGN KEY (Cno)REFERENCES Course(Cno)     /* 表級完整性約束條件， Cno是外碼，被參照表是Course*/
 ); 


INSERT  INTO  Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215121','李勇','男','CS',20);
INSERT  INTO  Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215122','劉晨','女','CS',19);
INSERT  INTO  Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215123','王敏','女','MA',18);
INSERT  INTO  Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215125','張立','男','IS',19);
INSERT  INTO  Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215128','陳冬','男','IS',20);

SELECT * FROM Student

INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('1','數據庫',NULL,4);
INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('2','數學',NULL,4);
INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('3','信息系統',NULL,4);
INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('4','操作系統',NULL,4);
INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('5','數據結構',NULL,4);
INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('6','數據處理',NULL,4);
INSERT  INTO Course(Cno,Cname,Cpno,Ccredit)	VALUES ('7','Pascal語言',NULL,4);

UPDATE Course SET Cpno = '5' WHERE Cno = '1' 
UPDATE Course SET Cpno = '1' WHERE Cno = '3' 
UPDATE Course SET Cpno = '6' WHERE Cno = '4' 
UPDATE Course SET Cpno = '7' WHERE Cno = '5' 
UPDATE Course SET Cpno = '6' WHERE Cno = '7' 

SELECT * FROM Course

INSERT  INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','1',92);
INSERT  INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','2',85);
INSERT  INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','3',88);
INSERT  INTO SC(Sno,Cno,Grade) VALUES ('201215122 ','2',90);
INSERT  INTO SC(Sno,Cno,Grade) VALUES ('201215122 ','3',80);

SELECT * FROM SC

 

普通用戶表：Utable

CREATE TABLE Utable
(userid CHAR(50),
password CHAR(50),
StuNo CHAR(50),
phone CHAR(50)
);

  管理員表Usertable：

CREATE TABLE Usertable
(
    Userid CHAR(50),
    Password CHAR(100)
)

  日誌表Syslog：

 CREATE TABLE SysLog          
 (	
 UserID NCHAR(20) ,                          
 DateAndTime datetime,
 UserOperation NCHAR(200)
 ); 

 

觸發器：

 

CREATE TABLE SysLog          
 (	
 UserID NCHAR(20) ,                          
 DateAndTime datetime,
 UserOperation NCHAR(200)
 ); //建立日誌表

IF(OBJECT_ID('regist_recorder') is not null)        -- 判斷名爲 regist_recorder 的觸發器是否存在
DROP TRIGGER regist_recorder        -- 刪除觸發器
GO

CREATE TRIGGER regist_recorder
ON Student  	         
AFTER
INSERT
AS 
	declare @UserName    nchar(20)
	declare @DateTime    datetime
	declare @UserOperation nchar(200)

	select @UserName = system_user
	select @DateTime = CONVERT(datetime,GETDATE(),120) 

	declare @op varchar(10)
	select @op=case when exists(select 1 from inserted) and exists(select 1 from deleted)
                   then 'Update'
                   when exists(select 1 from inserted) and not exists(select 1 from deleted)
                   then 'Insert'
                   when not exists(select 1 from inserted) and exists(select 1 from deleted)
                   then 'Delete' end
                   
	
	select @UserOperation = @op
	

	INSERT INTO SysLog(UserID,DateAndTime,UserOperation)
	VALUES (@UserName,@DateTime,@UserOperation)