游标存储过程视图标值

CREATE TABLE STUDENT
(	
	SID INT PRIMARY KEY IDENTITY,
	SNAME NVARCHAR(50),
	SAGE DATETIME,
	SSEX CHAR(4)
)
CREATE TABLE TEACHER
(
	TID INT PRIMARY KEY IDENTITY,
	TNAME NVARCHAR(50)
)
CREATE TABLE COURSE
(
	CID INT PRIMARY KEY IDENTITY,
	CNAME NVARCHAR(50),
	TID INT FOREIGN KEY REFERENCES TEACHER(TID)
)
CREATE TABLE SCORE
(
	ID INT PRIMARY KEY IDENTITY,
	SID INT FOREIGN KEY REFERENCES STUDENT(SID),
	CID INT FOREIGN KEY REFERENCES COURSE(CID),
	SCORES INT
)

–创建存储过程，为学生表插入数据

GO
CREATE PROC P_INSERTSTU
@SNAME NVARCHAR(50),
@SAGE DATETIME,
@SSEX CHAR(4)
AS
BEGIN
	INSERT INTO STUDENT VALUES(@SNAME,@SAGE,@Ssex)
END

–创建触发器，删除学生信息，删除后打印出‘警告：XX同学已被删除，请知晓！’

GO
CREATE TRIGGER T_DELETESTU
ON STUDENT
AFTER DELETE
AS
BEGIN
	DECLARE @STUNAME NVARCHAR(50)
	DELETE STUDENT WHERE SID IN (SELECT SID FROM DELETED)
	SELECT @STUNAME =SNAME FROM DELETED
	PRINT '警告：'+@STUNAME+'同学已被删除，请知晓！'
END

–创建触发器，修改学生信息，修改后打印出‘警告：XX同学已被修改为XX，请知晓！’

GO
CREATE TRIGGER T_UPDATESTU
ON STUDENT
AFTER UPDATE
AS
BEGIN
	DECLARE @STUNAMEUB NVARCHAR(50)
	DECLARE @STUNAMEUA NVARCHAR(50)
	SELECT @STUNAMEUA =SNAME FROM INSERTED
	SELECT @STUNAMEUB = SNAME FROM DELETED
	PRINT '警告：'+@STUNAMEUB+'同学已被修改为'+@STUNAMEUA+'，请知晓！'
END

–创建一个标值函数，参数是SCORES 返回是为NVARCHAR(50)类型，在函数中使用CASE WHEN THEN END 为成绩划分等级>60 ‘不及格’ >70 ‘及格’>80‘中等’>100‘优秀’=100‘满意’

GO
CREATE FUNCTION FUN_RANK(@SCORES INT)
RETURNS NVARCHAR(50)
AS
BEGIN
	DECLARE @RESTUCH NVARCHAR(50)
	SELECT @RESTUCH =
	(CASE WHEN @SCORES < 60 THEN '不及格',
		    WHEN @SCORES < 70 THEN '及格',
		    WHEN @SCORES < 80 THEN '中等,
		    WHEN @SCORES < 100 THEN '优秀',
		    WHEN @SCORES = 100 THEN '满意,
	)
	RETURN @RESTUCH
END

–创建一个视图，显示学生编号，学生姓名，课程名称，任课老师，以及调用标值函数为成绩划分等级

GO
CREATE VIEW V_STUDENT
AS
SELECT S.SID,S.SNAME,C.CNAME,T.TNAME,R.SCORES,DBO.FUN_RANK(R.SCORES) AS RANKS FROM STUDENT S JOIN SCORE R ON S.SID= R.SID JOIN COURSE C ON R.CID= C.CID JOIN TEACHER T ON T.TID = C.TID
GO

–使用行转列对成绩表重新划分

SELECT 
SID,
MAX(CASE WHEN CID = 1 THEN SCORES ELSE NULL END) '语文',
MAX(CASE WHEN CID = 2 THEN SCORES ELSE NULL END) '数学',
MAX(CASE WHEN CID = 3 THEN SCORES ELSE NULL END) '英语',
 FROM SCORE GROUP BY SID

–创建一个存储过程对成绩分页 ，输出总记录数

GO
CREATE PROC P_PAGESTU
@STUNAME NVARCHAR(20),
@PAGEINDEX INT,
@PAGESIZE INT,
@PAGECOUNT INT OUTPUT
AS
BEGIN 
	SELECT * FROM (
	SELECT R.SCORES,ROW_NUMBER() OVER(ORDER BY S.SID) AS NUM FROM STUDENT S JOIN SCORE R ON S.SID = R.SID WHERE S.SNAME LIKE '%'+@STUNAME+'%') TEMP WHERE TEMP.NUM BETWEEN ((@PAGEINDEX-1)*@PAGESIZE+1) AND (@PAGEINDEX*@PAGESIZE)
	SELECT @PAGECOUNT=COUNT(S.SID) FROM STUDENT S JOIN SCORE R ON S.SID = R.SID WHERE S.SNAME LIKE '%'+@STUNAME+'%' 
	)
END

–创建一个游标，正确读取学生的姓名即成绩

DECLARE CURSOR_SCORE CURSOR SCROLL
FOR SELECT S.SNAME,R.SCORE FROM STUDENT S JOIN SCORE R ON S.SID= R.SID
OPEN CURSOR_SCORE
DECLARE @STUNAME NVARCHAR(20)
DECLARE @STUSCOR INT
FETCH FIRST FROM CURSOR_SCORE INTO @STUNAME,@STUCORE
WHILE @@FETCH_STATUS =0
BEGIN
	SELECT @STUNAME=S.SNAME,@STUSCORE = R.SCORES FROM STUDENT S JOIN SCORE R ON S.SID = R.SID 
	FETCH NEXT FROM CURSOR_SCORE INTO @STUNAME,@STUSCORE
END
PRINT @STUNAME +成绩+CONVERT(NVARCHAR(20),@STUSCORE)
CLOSE CURSOR_SCORE
DEALLOCATE CURSOR_SCORE